1. Trailer Brake Controller
  2. Hayes
  3. Electric
  4. Electric over Hydraulic
  5. Proportional Controller
  6. Under-Dash Box
Hayes G2 Brake Boss Trailer Brake Controller w/ Mounting Sleeve - 1 to 4 Axles - Proportional

Hayes G2 Brake Boss Trailer Brake Controller w/ Mounting Sleeve - 1 to 4 Axles - Proportional

Item # HA81792BB
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Trailer Brake Controller
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Product Expert Kathleen M

Is this right for you? Product Expert Kathleen M says:

Yes, if you:

  • Prefer an American-made product
  • Have a large trailer or camper with up to 4 axles
  • Have a brand-new truck and don't want to drill into the dash

No, if you:

  • Swap drivers, trailers, or vehicles and need presets to save your settings
  • Hate troubleshooting and want the reassurance of clear diagnostics
Brake controller engages trailer's brakes in proportion to deceleration. Mounts with included sleeve within a 125-degree range. Easily adjust power output and braking aggressiveness. Includes digital display, audible alert, and manual override. Lowest Prices for the best trailer brake controller from Hayes. Hayes G2 Brake Boss Trailer Brake Controller w/ Mounting Sleeve - 1 to 4 Axles - Proportional part number HA81792BB can be ordered online at etrailer.com or call 800-298-1624 for expert service.
  • All Info
  • Reviews (24)
  • Q & A (20)
  • Photos
  • Why etrailer?

Hayes Trailer Brake Controller - HA81792BB

  • Electric
  • Electric over Hydraulic
  • Proportional Controller
  • Hayes
  • Under-Dash Box
  • Up to 4 Axles
  • Automatic Leveling
  • Dash Mount
  • 125 Degrees
  • LCD Display

Brake controller engages trailer's brakes in proportion to deceleration. Mounts with included sleeve within a 125-degree range. Easily adjust power output and braking aggressiveness. Includes digital display, audible alert, and manual override.


  • Brake controller activates trailer brakes in proportion to your vehicle's braking action
    • Automatically adjusts trailer's braking based on deceleration of tow vehicle
    • Activates immediately - no pausing like with time-delayed brake controllers
  • Automatically levels - internal sensor detects deceleration even if controller is not mounted flat
    • Position anywhere from -35 degrees to 90 degrees in the vertical plane
  • Adjustable gain setting lets you determine the power output sent to the trailer's brakes
    • Set to higher output when towing in hilly terrain or with a fully loaded trailer
    • Back off power when towing a lightweight or empty trailer
  • 4 Boost settings let you adjust initial braking power and aggressiveness
  • Large, easy-to-read LCD screen communicates brake power output, boost settings, and error codes
    • High-resolution screen is glare resistant
  • Easily accessible adjustment buttons let you change settings
  • Built-in safeguards protect your vehicle and trailer
    • Audible alert warns driver about wiring continuity problems
    • Manual override illuminates brake lights on tow vehicle and trailer
    • Current limiter protects vehicle from shorts in the trailer wiring
    • Hazard flasher immunity prevents pulsing of the brakes when flashers are activated
  • Bottom-mounted, slide-style manual override
  • Quick and easy installation
    • Plug-in, vehicle-specific brake control adapter (sold separately) can be used for certain applications to reduce installation time
  • Mounting sleeve attaches to tow vehicle's dashboard with 3M VHB tape - no drilling required
    • Allows the brake controller to be easily removed for storage or for use in a different vehicle
  • Made in the USA


  • Application: trailers with up to 4 axles (8 brake assemblies)
    • Designed for use with electric or electric-over-hydraulic brakes
  • Mounting position: between -35 degrees and 90 degrees in the vertical plane
  • Dimensions: 5" long x 3-1/4" wide x 1-1/4" tall
  • Limited lifetime warranty

Proportional Braking

With a proportional brake controller, you can get heavy-duty emergency braking, general braking, or slow-to-an-idle braking for your trailer automatically. The intensity with which your trailer brakes are activated and the rate at which they are applied are dependent on the deceleration of your tow vehicle. This means that, unlike time-delay controllers - which send the same amount of preset power to your trailer brakes every time - proportional controllers are able to adapt to every braking situation differently.

So, if you slam on the brakes in your truck, your trailer brakes will activate with that same extreme intensity. And if you merely slow down as you approach a red light, your trailer will gradually brake in the same manner.

As long as the Brake Boss is properly mounted according to the included instructions, the controller will automatically level, sense the tow vehicle's deceleration, and adjust the trailer's braking. The result is uniform braking across your towing setup. No push-pull action - just smooth, proportional braking every time.

Built-In Controls on the G2 Brake Boss

G2 Brake Boss Controls

The diagram above shows the controls and components of the Hayes G2 Brake Boss electric trailer brake controller.

Power Output Control

The power output control lets you set the maximum amount of power that will be applied to your trailer's brakes. Typically, the power output is only readjusted if you switch from a heavy, loaded trailer to a much lighter, empty trailer - or vice versa.

During the installation setup process, use the adjustment buttons on the front right side of the G2 Brake Boss controller to adjust the power output. To get more power to your brakes, press the "up" button. To decrease the power output, press the "down" button. The output can be raised or lowered in 5-percent increments.

Power Boost for Heavy-Duty Towing

The Hayes G2 Brake Boss also offers a boost feature that gives you more initial braking power for those times when you're towing heavy loads or a larger trailer. You can switch boost levels so that the power output to your trailer brakes automatically starts out at a set percentage of the predetermined power setting.

If you're towing a heavy load, sending out more initial power to the trailer brakes - and causing them to reach maximum braking faster - allows you to better control the trailer so it doesn't push your tow vehicle before coming to a complete stop.

To set the initial power, press the menu button and select from one of the available settings. (B0 is 0 percent, B1 is 5 percent, B2 is 10 percent, B3 is 15 percent, B4 is 20 percent.) The higher the setting, the more aggressive the braking will be. Hayes makes the following recommendations for which boost setting(s) to use with your towing setup:

Approximate Gross Trailer WeightBoost SettingIncrease in Initial Power Output
Much less than the tow vehicleB0 or B10 percent or 5 percent
Less than the tow vehicleB210 percent
Roughly equal to the tow vehicleB2 or B310 percent or 15 percent
Slightly greater than the tow vehicleB3 or B415 percent or 20 percent
Much greater than the two vehicleB420 percent

Digital Display

The G2 Brake Boss features a large LCD display where the brake type, power output, boost settings, alarms, and diagnostics are shown. You can set the color, intensity, and contrast on the display.

While braking, the display shows the amount of power going to the trailer brakes as a percentage of the total available. You can change this display to show voltage or amperage during trailer set-up or when troubleshooting problems.

The Brake Boss will display the word "Warning" when it senses problems, and it will help you troubleshoot these problems by indicating the following: Output Short - No Brakes, Overload - Excessive Amps, No Trailer, or Blue Wire Fault - Voltage Present. The controller will deliver an audible alert when these warnings display, unless you choose to turn it off.

Slide-Lever Manual Override

The manual slide lever is located on the bottom of the unit. To activate it, just pull the lever forward. The manual slide lever overrides the preset power output and allows the operator to engage the trailer brakes without using your vehicle's brakes. In addition to being a necessary safety feature, this option helps to control trailer sway by slowing the trailer to put it back solidly behind the tow vehicle.

You can also engage the manual override to help you move a sliding 5th-wheel hitch closer to your truck's tailgate for tight maneuvering during slow speed turns. Just apply the manual override to hold the trailer in place while slowly moving the tow vehicle forward.

Installation and Wiring

G2 Brake Boss Mounting Angles

Because this controller operates with an internal inertia sensor, it must be mounted between -35 degrees and 90 degrees in the vertical plane. The G2 Brake Boss must be mounted on a level horizontal (side-to-side) plane and must be lined up with the direction of travel for the internal sensor to function properly.

The Brake Boss comes with the Hayes Quik-Receiver. The Quik-Receiver is a mounting sleeve that attaches to your dashboard with 3M VHB tape - no drilling is required. With the Quik-Receiver you can easily remove the Brake Boss for storage or transfer it to another tow vehicle. A replacement wiring harness (sold separately) and a replacement Quik-Receiver bracket (sold separately) are required to move the controller from one vehicle to another.

Installation of the G2 Brake Boss requires that you either purchase a custom wiring adapter designed to plug into the controller or that you hardwire the controller directly into the vehicle. To hardwire the Brake Boss, you must remove the plug at the end of the integrated wiring harness.

Installation Accessories

The Hayes vehicle-specific, dual-mated wiring adapter is available for most newer trucks and SUVs with tow packages. One end of the custom adapter plugs into your vehicle's brake controller port, and the other end plugs into the controller - no hardwiring required.

Hayes also offers a universal wiring harness (HA81789-HBC - sold separately) that plugs into the back of any Hayes brake controller. The 4 leads on the universal harness can then be hardwired into your vehicle. By splicing the universal adapter into your wiring instead of directly connecting the brake controller to your wiring, you gain the ability to unplug and remove the controller from your vehicle should the need arise.


  • If a custom brake-control wiring adapter is not available for your vehicle, one of the following will be required:
    • 20-Amp circuit breaker (9506P - sold separately) for 2-brake applications
    • 30-Amp circuit breaker (38630 - sold separately) for 4- to 6-brake applications
    • 40-Amp circuit breaker (9510 - sold separately) for 6- to 8-brake applications
  • If you're hardwiring the controller, it is also suggested that you install an in-line fuse between the controller and the stop light switch (required on 1999 and newer Fords).

See also etrailer.com's exclusive 7- and 4-way brake control installation kit (ETBC7 - sold separately) if you don't already have a 7-way plug at the back of your vehicle.

81792BB Hayes G2 Brake Boss Electric Brake Controller w/Bracket - Proportional

Installation Details HA81792BB Installation instructionsAlternate Instructions HA81792BB Installation instructions

Customer Reviews

Hayes G2 Brake Boss Trailer Brake Controller w/ Mounting Sleeve - 1 to 4 Axles - Proportional - HA81792BB

Average Customer Rating:  4.5 out of 5 stars   (24 Customer Reviews)

Brake controller engages trailer's brakes in proportion to deceleration. Mounts with included sleeve within a 125-degree range. Easily adjust power output and braking aggressiveness. Includes digital display, audible alert, and manual override.

- HA81792BB

Wow! I had ordered this Haye G2 controller originally from Wal-Mart and they missed the shipping date- had to borrow one. On my next trip, I was about a week out and found one on etrailer. It was priced lower than Wal-Mart, and I received it in TWO days- without paying for shipping! They even checked to make sure I was satisfied. My trip is now solid and I have a great place to shop for all my towing needs- thank you etrailer!

This Hayes G2 brake controller is easy to use and works great. etrailer has the best price and helped me when I had questions about the unit.
Kevin - 10/04/2021

- HA81792BB

Following instructions, using the alcohol wipe to clean the dash mounting surface, I mounted the controller sleeve with the sticky tape. It feel off immediately. I stuck the sleeve on again and left it overnight, hoping the adhesive would grab and stay. It didn't. I drilled two holes through the sleeve and dash and installed it again using two screws. Even thought I haven't used the brake controller yet (I don't get the used trailer I bought for another two weeks), I will have to go to larger screws because the ones I used are pulling out with just the weight of the controller pulling down on them as I drive around. The screw heads are an issue bigger heads may not allow the controller to slip past them in the sleeve. The controller itself looks great. We'll see how it works. Meantime, the 3M sticky mount is useless.

- HA81792BB

This was an awesome product 5-minute install on my 2019 Ram 1500 cannot wait to put it to use

Working great ??
Alan M - 08/28/2020

Works awesome
Alan M - 08/28/2020

- HA81792BB

excellent brake controller I don't feel any pulling or pushing from the trailer.

- HA81792BB

Wow, took me a whole 30 seconds to install and plug up with the wiring adapter. have not tried it yet, but it looks great. I don't know how to send photos on the computer or I would.

- HA81792BB

Easy installation with the vehicle specific harness. Took about 15 min to install. Only pulled trailer once with controller but it worked perfect. Highly recommend.

- HA81792BB

Don’t like this controller to hard to see readout and over complicated

- HA81792BB

Really pleased to see that this was made in USA - I can assume quality on such a safety-critical item. It fit right and was easy to install. Simple to setup and use. 4 stars because I don't like that the screen stays on for a while while the truck is off. Battery drains are a pet peeve of mine.

- HA81792BB

First of all I'd like to say kudos to e-trailer for getting a brake controller and wiring to my house in Vermont from their place in Missouri overnight. I was shocked when It got here so fast, they saved my vacation. I really like the Hayes brake controller it works very well and is predictable. It's also very easy to set up once it's all connected. It was a breeze to install particularly on my 2006 Nissan Titan, it was two plugs, and stick it on the dash, and I was done. The only thing I need now is a bigger better truck to pull my 8000 pound trailer up to the speed limit, never did make it. The Nissan is a bit week for the job and it overheated a couple of times on hills and I had to turn on the heater to drain extra heat and bring the temperature back down, no AC allowed. But the trip went well nonetheless. My next truck will be diesel with dual wheels four-wheel-drive, no monkeying around next time. Thanks e-trailer! I'll be back to get my gear for my next truck from e-trailer for sure??

- HA81792BB

Very timely delivery, everything arrived on time just as I was told. Very quick and easy installation in my 2017 Dodge Ram.

All is great after a year of use.
Rickey P - 06/07/2020

- HA81792BB

The Hayes G2 was very simple to install in my 2012 Ram 1500. The two sided tape did not hold for me, probably the cold temps up here in upstate NY, but I was able to use the included screews to secure the cradle. The bundled wiring adapter made the installation plug and play, so much easier then the old pigtails and electric tape. The factory default of 50% power and 10% gain should be about what I need to handle my nearly 3000 lb (fully loaded) pop-up but I will be able to fine tune that once I am able to have a proper test drive. I am very pleased with this controller so far. Can't wait for our first trip of the season!

- HA81792BB

Very small and very easy to install and mount !! I am a 25 year auto mechanic and tell you any one can install this brake product... 10 min. install time. and will display in several colors. The green display was easy for me to see.. have not pulled my trailer yet but a easy install and mount in a covey hole like it is a factory piece. Rev. Tucker

- HA81792BB

Mounting and connection are easy if you have the factory tow wiring. Works perfectly controlling the brakes

- HA81792BB

Installation was easy, just plug and play. No issues so far.

- HA81792BB

Great product, easy to install

- HA81792BB

Good install info. Easy hook-up. Plan on hauling hay tomorrow so will give it a good test.

- HA81792BB

The service is 5 star.

- HA81792BB

Came quick, just as ordered.

- HA81792BB

- HA81792BB

Easy install, perfect size for my Titan.

- HA81792BB

- HA81792BB

- HA81792BB

- HA81792BB


Ask the Experts about this Hayes Trailer Brake Controller

  • Which Brake Controller Adapter Plug for Hayes G2 Brake Boss on 2000 Ford F-150
    For your 2000 Ford F-150 you can install the Hayes G2 Brake Boss # HA81792BB using the plug and play adapter # HA81783-HBC. This will keep you from having to splice into any wires and hard wire the controller into your truck.
    view full answer...
  • Brakes Will Not Release and Brake Lights Stay On Using Manual Override On Hayes G2 Brake Boss
    If the manual override is not releasing then I am afraid there is an internal error on the Hayes G2 Brake Boss Trailer Brake Controller part # HA81792BB and it will need to be replaced as brake controllers are not repairable. The brake lights are staying on because the brake controller sends a signal to these lights with the manual override applied. For replacement, I recommend upgrading to the Hayes Genesis Trailer Brake Controller part # HA81790 which will use the same plug as your...
    view full answer...
  • Is The Manual Override Lever On Hayes G2 Brake Boss Trailer Brake Controller Spring Loaded
    The manual override lever on Hayes G2 Brake Boss Trailer Brake Controller w/ Mounting Sleeve # HA81792BB you were looking at is spring loaded so when you release the lever it returns the trailer brake controller back to normal. I included a video of the Hayes # HA81792BB for you to take a look at.
    view full answer...
  • Installation of Hayes G2 Brake Boss Trailer Brake Controller on 2004 Ford Ranger
    We do have a video of a brake controller being installed in a 2002 Ford Ranger but it's not the Hayes G2 Brake Boss, part # HA81792BB. With that being said since the truck is the same generation as your 2004 and brake controllers are universal as far as the installation goes the process is basically the same. The video also uses our installation kit, part # ETBC7, which you'll need if your Ranger doesn't have a 7-way connector. The kit installs into an existing 4-way converting it...
    view full answer...
  • Fit of Hayes G2 Brake Controller # HA81792BB on 2004 Ford F150
    A brake controller isn't a vehicle-specific item, so the Hayes G2 brake controller you mentioned, part # HA81792BB would work just fine. You would need a wiring adapter, part # HA81783-HBC that would plug into the rear of the controller and into the connector located under the vehicle dashboard. As you can see in the provided photo, the brake controller is located behind the OBD port under he steering column. It's located above the OBD port and to the right.
    view full answer...
    Image 1 for
  • What Angle Does the Hayes G2 Brake Boss Have to Be Installed at for Proper Function
    The Hayes G2 Brake Controller part # HA81792BB has to be installed in a specific angle range otherwise the proportional sensors of the controller will not accurately be able to sense braking activity and apply the correct amount of braking power to the trailer. If the controller being totally level and squarely facing the rear of the vehicle it is 0 degrees, then 94 degrees would be slightly past totally vertical and -35 degrees would pretty close to the middle of facing directly at...
    view full answer...
  • Parts Needed to Install Brake Controller On 2008 Hyundai Veracruz
    To install the Hayes Trailer Brake Controller # HA817922BB, you will want to use the Hayes Universal Wiring Adapter # HA81789-HBC. This pigtail will splice into your vehicle. The white wire needs to be grounded. The black wire will connect to the battery. The red wire goes to the stoplight wire. The blue wire is connected to the trailer connector at the rear of the vehicle. You will also need a wiring harness for your vehicle if you don't already have one. I recommend the Tow Ready...
    view full answer...
  • Hayes G2 Brake Boss Controller with Brake Controller Adapter for 2001 Chevrolet Silverado
    Yes, the brake controller adapter is included with the brake controller if you go through the Fitguide on the website with the 2001 Chevrolet Silverado and click on brake controller. The Hayes brake controller is part # HA81792BB. The brake controller adapter part # HA81781-HBC plugs into the junction box under the dash of the Chevy and the other end plugs into the Hayes brake controller. If your truck has a 7-way the Hayes brake controller and adapter are all you need. If your Chevy...
    view full answer...
  • Troubleshooting Output Short Message on Hayes G2 Brake Brake Boss Controller part # HA81792BB
    The message you are seeing on your Hayes G2 Brake Controller part # HA81792BB indicates that there is a short on the brake output circuit of the brake controller. Since it is showing this code with the trailer disconnected that would mean the problem is on the truck like you suspected. Commonly this is due to corrosion on the trailer connectors. This can be fixed by hitting the connector with some fine grit sandpaper. Aside from that you will need to trace the wiring from the brake...
    view full answer...
  • Brake Controller Port Location in 2016 Ram 1500 Laramie
    Often a brake controller connector will be tucked up pretty high and out of the way, and sometimes it will even be taped to other wiring or other components behind the rear side of the dash. It can definitely be hard to spot them sometimes. There may be a foam wrap or cap on the connector to protect its electrical contacts. The vehicle's trim level, such as the Laramie edition, generally does not affect internal components like wiring parts.
    view full answer...
  • Troubleshooting Trailer Brakes That Intermittently Lock Up With any Brake Pressure
    Sounds like the problem is on the trailer's wiring as the issue you are having has shown up with two different tow vehicles. The most likely situation you have is that your brake light circuit is shorting out to your brake output circuit which is causing your trailer brakes to apply fully when the brakes are applied. Do you notice the brakes applying or locking up when the blinker is applying as well? If so, that blinker circuit on your trailer wiring is shorting to the brake output...
    view full answer...
  • Troubleshooting Brake Controller Install that Activates Vehicle Brake Lights When Connected
    Sounds like the wiring of your Hayes G2 Brake Boss Trailer Brake Controller # HA81792BB needs to be checked. Can you verify that the black wire of the controller is ran to a 12 volt power source, the red to a circuit that only sees voltage when the brakes are applied and the blue to the output circuit of your 7-way? The white should also be grounded but since your controller is coming on it sounds like that circuit is properly connected.
    view full answer...
  • Is Hayes G2 Brake Boss Trailer Brake Controller HA81792BB Made in the USA
    Yes, the Hayes G2 Brake Boss Trailer Brake Controller # HA81792BB is made in the USA. In comparison to the Draw-Tite I-Command # 5535 (which is not USA-made) the Hayes allows for a wider range of installation positions, anywhere from -35 degree to +90 degrees in the vertical plane. The Draw-Tite requires a slightly tighter installation range of -20 to +70 degrees. Both work with electric and electric-over-hydraulic brakes on up to 4 axles and both are covered by a limited lifetime warranty....
    view full answer...
  • Hayes G2 Brake Boss Trailer Brake Controller Recommendation for a 2011 Jeep Grand Cherokee
    Yes, you can install the Hayes G2 Brake Boss Trailer Brake Controller w/ Mounting Sleeve # HA81792BB in your 2011 Jeep Grand Cherokee. The connector should be mounted on top of the emergency brake bracket, it's gray in color. Once you find it all you need to do to install this controller is plug the Custom Wiring Adapter for Hayes Brake Controllers # HA81796-HBC into the port under your dash and then plug the other end into the # HA81792BB, mount it, and you'd be good to go.
    view full answer...
  • Harness for Installing Hayes Brake Controller in 2016 Chevy Silverado 1500
    To install a Hayes brake controller like the # HA81792BB in your 2016 Chevy Silverado only requires the install harness part # HA81798-HBC and you'd be set.
    view full answer...
  • What PSI is the Titan Brake Actuator T4813102 Rated For?
    The Titan BrakeRite I Plug and Play Electric-Hydraulic Actuator Kit # T4813102 has the maximum hydraulic pressure of 1,500 psi. As this is an electric over hydraulic system, you will not be able to use the Hayes-Lemmerz Energize III+ Electric Trailer Brake Controller # HA81742B, unfortunately. That being said, If you wanted a Hayes controller that is compatible with electric over hydraulic systems, you will want the G2 Brake Boss # HA81792BB. This is also a proportional controller and...
    view full answer...
  • Bypassing Factory Brake Controller (ITBC) on 2017 Ram 3500
    Even after they've been out for more than 10 years, we continually hear complaints from folks about the factory integrated brake controllers on their trucks. We never seem to hear "I love it, it works great!" From what I understand, the factory brake controllers have a power adjustment that allows you to increase or decrease the intensity of the braking force and a manual switch that applies the trailer brakes independently of the truck brakes. That's it, no further adjustments are possible. If...
    view full answer...
  • Is There a Harness for Brake Controller on 2016 Jeep Renegade?
    All brake controllers on your 2016 Jeep Renegade, including one such as the Hayes # HA81792BB, will need to be hardwired in as there is no compatible harness. Due to the difficulty in locating the stoplight wire it is recommended to get your brake controller professionally installed. The brake controller I strongly recommend is the Prodigy P3 # 90195; it is the most popular model we carry due to its effectiveness and ease of use. It will activate your trailer's brakes immediately in...
    view full answer...
    Image 1 for
  • Can Hayes G2 Brake Controller Activate Tandem Axle Brakes Install Harness for 2013 Toyota Tundra
    Yes, the Hayes G2 brake controller part # HA81792BB can activate the brakes of a tandem axle trailer that has brakes on all axles. The correct custom fit install harness for the controller in your 2013 Toyota Tundra that is pre-wired for a brake controller is the part # HA81785-HBC which is all you'd need.
    view full answer...
  • Installation of New Brake Controller with Current Reese Adapter on 2004 Chevrolet Silverado
    It sounds like your current brake controller adapter looks like the # 3015-P which is needed to plug into your 2004 Chevy Silverado's port. The brake controller (P2 or P3) will include a universal wiring harness that will connect to all the connections needed, so you will not need another adapter if your current adapter isn't actually the # 3015-P and doesn't fit, you will just use the included harness and butt connect to your current adapter. The Hayes G2 # HA81792BB will use the #...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Kathleen M
Updated by:
Kathleen M
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Jenny M
Updated by:
Jenny M
Employee Noah M
Updated by:
Noah M
Employee Cole B
Installed by:
Cole B
Employee Tammy D
Written by:
Tammy D

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