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  1. 5th Wheel Hitch
  2. Demco
  3. 21000 lbs GTW
  4. Aftermarket Below Bed Rails
  5. Sliding 5th Wheel
  6. Premium - Single-Hook Jaw
THIS ITEM IS NOT A FIT FOR
2004 Ford Excursion
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Demco

Demco Recon Sliding 5th Wheel Hitch for Chevy/GMC - Single Jaw - Underbed - 21,000 lbs

Part Number: DM66KV
In Stock
$1,749.63
5th Wheel Hitch
Not Confirmed to Fit

2004 Ford Excursion

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This hitch manually slides to give you 14" of clearance for tight turns. Sturdy wraparound jaw has a locking bar for added security. Pivoting head allows easy hook up and helps limit chucking. Polyurethane bumpers ensure a smooth ride. 1-800-940-8924 to order Demco 5th wheel hitch part number DM66KV or order online at etrailer.com. Free expert support on all Demco products. Great prices and Fastest Shipping for Demco Recon Sliding 5th Wheel Hitch for Chevy/GMC - Single Jaw - Underbed - 21,000 lbs. 5th Wheel Hitch reviews from real customers.
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Demco 5th Wheel Hitch - DM66KV

Highlights

  • Custom Fit for Your Vehicle: Mounts to existing attachment points
  • Strength You Can Rely On: Rated for 21,000 lbs GTW and 4,000 lbs vertical load for towing heavy 5th wheels.
  • Tight Turn Clearance: Manual slider gives 14" of fore/aft travel to prevent cab contact during sharp turns.
  • Secure, Solid Connection: Wraparound single-piece jaw with 3/4" thick locking bar keeps your trailer firmly coupled.
  • Smooth, Quiet Ride: Double-pivot head and polyurethane dampeners reduce chucking and absorb road shock.
  • Set Your Perfect Height: Adjustable to 18-3/8", 19-5/8", or 20-7/8" for level trailer setup and bed rail clearance.
Made in USA

Features to know about

Built for Confident Heavy-Duty Towing: 21,000 lbs GTW and 4,000 lbs Vertical Load Limit

This hitch is rated for 21,000 lbs gross towing weight and a 4,000 lbs vertical load limit, giving you the strength you need for serious 5th-wheel towing. The sturdy steel construction and rust-resistant black powder coat finish help it stay solid and reliable over the long haul. It’s a setup that feels secure and steady every time you back in and pull out onto the road.

Tight Turns Without the Stress: Manual Slider with 14" of Travel

For short-bed trucks, making sharp turns can be a real worry. The manual slider gives you 14" of front-to-back travel, creating the clearance needed for slow, tight turns without your trailer getting too close to the cab. It’s designed so turning and parking in tight spaces feels controlled instead of stressful.

Locked-In Connection That Stays Quiet: Wraparound Single Jaw with Locking Bar

The wraparound, single-piece jaw provides 360-degree king pin contact for a secure, snug connection. A 3/4" thick solid steel locking bar reinforces that link once it’s coupled, cutting down on movement and noise compared to slide-bar jaws. The result is a firm, stable connection that tows quietly mile after mile.

Smooth Ride Over Bumps and Hills: Double Pivot Head with Polyurethane Dampeners

The double-pivot head moves both front to back and side to side so it can follow the trailer naturally over uneven roads. Polyurethane bumpers cushion the motion and absorb road shock, helping reduce chucking between the truck and trailer. Every bump feels more controlled, keeping both you and your gear comfortable on long trips.

Simple Setup Every Time: Adjustable Height from 18-3/8" to 20-7/8"

Getting level is easier thanks to three hitch height settings at 18-3/8", 19-5/8", and 20-7/8". You can dial in the fit for your specific setup without extra fuss. The spring-loaded handle with comfort grip makes coupling straightforward, while the tethered safety pin keeps it locked securely during travel.

Specs

Application

  • Designed for use on: 6-1/2' truck beds
  • Fits standard pin boxes: 12" - 14" wide

Weight and Capacity

  • Gross towing weight: 21,000 lbs
  • Vertical load limit: 4,000 lbs

Dimensions

  • Travel: 14" front to back
  • Hitch height settings: 18-3/8", 19-5/8", and 20-7/8"

Warranty

  • Limited warranty: 5-Year

8550064 Demco Recon Manual Slide 5th-Wheel Trailer Hitch - 21,000 lbs

6436 Demco UMS Under Bed Mount Adapter Plates for Recon Manual Slide 5th Wheel Trailer Hitch

8551010 Demco Hijacker UMS Under Bed Rail Frame Bracket Kit

Replaces Demco DM8551002 and DM8551003

Installation Details DM66KV Installation instructions



Video of Demco Recon Sliding 5th Wheel Hitch for Chevy/GMC - Single Jaw - Underbed - 21,000 lbs
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Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Mount: Demco Autoslide 5th Wheel Trailer Hitch for Chevy/GMC on a 2018 Chevrolet Silverado 2500

Hi there Silverado owners. Today on our 2018 Chevrolet Silverado 2500 we're going to be installing Demco's Underbed Rail Installation Kit for the Demco Hijacker 5th Wheel or Gooseneck. If have a gooseneck trailer, the underbed rail kit will also work with Demco's Hijacker Gooseneck Hitches. This underbed rail kit is going to allow you to install a Demco 5th wheel or a gooseneck hitch on your Silverado.With your new 5th wheel or gooseneck hitch installed you can haul that toy hauler, or 5th wheel trailer that you've been wanting to haul, or you can go ahead and put it to work out at the job site. The rails will work with any Demco Hijacker 5th wheel or gooseneck hitch. You'll want to make sure you pick the appropriate hitch for your needs.One of the things that I really like about this kit is that it installs underneath your bed so when you take your 5th wheel or gooseneck out you have a nice clean look.

Unlike raised rails that will stick up above your bed.I also like how easy it is to install. You use the existing holes in your frame so there's no drilling required, which really cuts down on the install time and the amount of fatigue you're going to have putting it in.Another thing I really like about this kit is that it'll allow you to use the Demco Hijacker 5th wheel, which works out great for tighter turns than you'll get with other ones. Especially if you have a short bed truck due to it's auto slide feature.We'll begin our installation in the bed of our truck by marking out the locations where we're going to drill to install our underbed rails. These measurements are going to vary depending on the length of the bed of your truck so you'll want to closely look at those measurements and mark it out like we've got here. You'll find specific measurements for your truck in your instructions.Well now I need to drill four holes using a two-inch hole saw.

We're going to do it at each corner where we marked. You can see this in the diagram in your instructions. We'll now repeat that for the three remaining holes. With all of our holes drilled out we can clean up the metal shavings now. Then we'll use some clear coat to prevent any rust and corrosion around our exposed metal where we drilled.

You can use some general purpose cleaner to clean off any of the markings that you made when determining where your hole location should be.Now that we've completed all the cutting we need to do in the bed, we can begin mounting our underbed rails. We're going to start with the side rails that are going to mount onto our frame here. Your rails are going to be labeled. We're on the passenger side. We've grabbed our passenger side side rail here.

We'll be using four of the longer bolts that come in your kit with hex heads. We'll then prepare these by placing lock washers and flat washers on them. We'll have four like this, for each side, prepared to install the rail onto the side of the frame by setting it on there and matching up the holes that's already existing in your frame, with the holes on our side rail. You'll see it's already got weld nuts in it. You simply take your bolt, slide it through and thread it into the frame. We're going to do this with the remaining three holes that have weld nuts. We'll repeat this on the other side.For our third holes that don't have weld nuts, we'll use the fish wire provided in the kit. We're going to go through the hole until it comes out the other side of the frame. You might have to finagle it around to get it through the other side. Then on the other side of your frame, we're going to slide a spacer over our fish wire. Then thread one of the carriage bolts, that come in the kit, onto the fish wire. First you'll feed in your spacer, then your bolt, then we'll just pull them through till it comes out the other side. Once you've got it pulled through, we'll place a nut on this side. We're going to repeat this with the other hole on this side and the two on the other side.You'll receive blue Loctite in your kit. You want to make sure you put some of that on all of your bolts.Next we'll be sliding our cross rails from one side of the frame across to the other but in order to get them to fit you are going to have to cut out a small section here. You don't need to cut it completely out. We're actually just going to cut it straight up. We're just going to go up like this. We're going to just be doing this around the section where you see the slits in your side rail. You want to make sure it's wide enough to fit your cross rail in. It's about three and a half inches. If you cut it there you could check to see if it'll fit. You may need to notch the sheet metal here at the bottom as well, in order to get it to fit.Now if it does get tight when pushing it in, you may need to loosen the bolts to your truck bed to get the extra clearance or if it's really close, like ours is, you could just take a piece of wood or a rubber mallet and tap it in. We're going to do the exact same process for our front rail. With both of our rails in place we can take the hardware that comes in our kit. We're going to be using the shorter large diameter hex head bolts with a flat washer on it. This is going to slide up through our slide rail. We're going to place a spacer plate underneath the rail. This has got to go through the front most hole, through the side rail, through your spacer plate and then into your cross rail. On the top we're going to place a nut. We're going to repeat that for the three remaining holes for both of your cross rails.We'll now tighten down all of our hardware using a one-inch socket. You may need a one-inch wrench to hold the nuts on some of them. Before you torque everything down, it's not a bad idea to take your 5th wheel, set it onto your base rails, to make sure that it's going to line up properly. If everything then you can go back and torque all the hardware to the specifications found in your instructions. If your 5th wheel doesn't fit you may need to loosen the hardware and slightly shift the rails until it lines up. Now with your rails torqued down you can install your Demco 5th wheel or gooseneck and hit the road.That completes our installation of Demco's Underbed Rail Installation Kit for the Demco Hijacker 5th Wheel and Gooseneck on your 2018 Chevrolet Silverado.

Ratings & Reviews

4.4

237 reviews
5 Stars
(184)
4 Stars
(29)
3 Stars
(16)
2 Stars
(2)
1 Star
(6)
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by:
Arrived right on time, Sales associate very knowledgeable and completed my order with Ease.
by:
Chevrolet Silverado 1500
Good quality hitch, light weight, easy to slide . Got about 1500 miles pulling 17000lb trailer with no problems
by:
The instructions provided with the hitch were very detailed and provided enough information for me to install it myself. I love having the mounting rails below the bed. the auto slide worked flawlessly. For the winter I left the hitch coupled with the trailer to keep my bed clear.
by:
Merchandise arrived in good condition. Nothing missing. The shipping carton was in terrible condition. It was torn open from shipping, however nothing was missing or damaged . The product will fill my needs to replace the above bed rails that don't leave a clean bed when fifth wheel is removed. This will fill the bill. Thanks to Etrailer this will work perfectly for my Demco hijacker fifth wheel. Shipment was quick delivery.
by:
Kit made for my rig and fit as described. Installation a little on the difficult side for your typical DIY'er.
Kirk C. profile picture

Kirk C.

7/26/2020

The under bed kit is the best. Having the truck bed useful when not traveling is great. I use a small electric hoist and casters for lifting and moving so the weigh is no problem. Installation was a little on the difficult side but any experienced DIYer can handle it.

by:
2017 GMC Sierra 2500
First package was destroyed in shipping, all hardware was missing, called etrailer forgot her name ( sorry ) very polite. she ordered all the correct hardware needed and had it shipped out. Except for the shipping was very pleased with etrailer.
by:
This product is nice but doesn’t line up with OEM placement of pucks.
Sierra K. profile picture
Etrailer Expert

Sierra K.

8/23/2021

That is because this product only fits vehicles without The OEM Prep Package. You want something like this: Item # DM6194.

by:
2018 Chevrolet Silverado 3500
Once I mounted everything and figured out I had to switch passenger and drivers brackets everything was fine it worked out ok
by:
It arrived in two days. Great delivery.
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2012 Chevrolet Silverado
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2026 Chevrolet Silverado 2500
I'm not real impressed with this hitch i had the trailer lifted bought taller tires and wheels and have all adjustments at lowest settings and still not level
Heather A. profile picture
Etrailer Expert

Heather A.

5/26/2026

Thanks for the feedback, we’d like to take a closer look with you to make sure everything is set up correctly. On a 2026 Silverado, the truck height can vary depending on configuration, so a few details will really help us narrow this down. When you have a moment, could you let us know what trailer make and model you’re towing, and whether it’s sitting nose-high or nose-low when connected? Also, do you know which hitch height position you’re currently using on the Demco Recon 5th Wheel Hitch w/ Slider (top, middle, or bottom setting), and whether you’re using the factory puck system on your Silverado? Once we have that information, we can help confirm whether this is an adjustment issue or if another setup change is needed to get everything sitting level.

David H. profile picture

David H.

5/26/2026

@HeatherA 2018 open range 319rls setting nose high i had it lifted the legal 2 inch and purchased tires and wheels that gave 3 more inches of lift while still fitting the wheel wells
Heather A. profile picture
Etrailer Expert

Heather A.

5/27/2026

@DavidH Thanks for the additional information, David. Since the trailer is still sitting nose-high even after the lift and taller tire setup, the next thing we’d want to confirm is which height position the hitch itself is currently set to on the Demco Recon 5th Wheel Hitch w/ Slider. Do you know if the pivot arms are mounted in the top, middle, or bottom hole position? That will help us determine whether there’s still some adjustment available or if we’re running into a height limitation between the truck and trailer combination. Does your truck have a lift?
David H. profile picture

David H.

5/27/2026

@HeatherA my truck is stock 2 weeks old I could get the right height with a b&w hitch just more than I can afford now I know why the hitch place in kingman az won't deal with any demco product
by:
2021 Ram 2500
This was a perfect fit into my 2500 Ram. It was delivered in perfect condition. I had a hard time finding the correct torque for some of the Bolts, for example the Bolts for attaching the Ram puk system to the hitch frame. It all worked out well. It took me one hour to put it together and install it in my Ram.
by:
2021 Ram 3500
Very satisfied with this product! A bolt on Teflon plate would be awesome instead of the round disks that wear out and become hard to keep in place during the hitching process.
by:
Putting the OEM package together for the puck system was very easy. All components look and move as they should. So far so good! Thanks etrailer.com
Gwendolyn Y. profile picture
Etrailer Expert

Gwendolyn Y.

5/21/2025

5th wheel looks great in your truck, Paul! What kind of trailer are you hauling?

by:
2021 Ford F-250 Super Duty
Purchased for my 2021 Ford F-250. Arrived 3 days ahead of schedule with excellent communication. Was professionally delivered in 1 shipment on 1 pallet in perfect condition.
Great instructions. Is easy to install for the mechanically minded. Will take a novice longer but they will have no issues if they follow the instructions. All I needed was a 3/4" wrench/socket, a 1 1/8" wrench, and a torque wrench. Puck handles were on upside down from factory but didn't matter you will need to take them off in step 1 to add or remove washers for the perfect fit on your OEM puck setup. Excited to hook up and start using it!
Victoria H. profile picture
Etrailer Expert

Victoria H.

3/18/2025

Thanks Patrick! I appreciate you taking the time to share your valuable insight. It looks like you're ready to roll. Do you have any trips planned yet?

by:
2002 Ford F-350 Super Duty
The truck that got the install is a 2002 Ford F350 Super Duty 7.3 L Diesel dually. The Demco Recon 5th wheel hitch (DM8550043) looks like a well made, heavy duty hitch. All the welds are precise and well done. I like the single wrap around jaw with the real thick bar that backs that up. The handle that pulls out to unlock the jaw moves with ease and locks in the out position when the jaw opens. When the king pin comes in contact with the back of jaw, the jaw wraps around the king pin, the handle closes, you put in the safety pin and your ready to go RVing. I chose the Husky Custom Rails and installation kit (HT31405-686) for my install. The reason I chose these rails over the ones that etrailer had matched up for the hitch is, I had previously installed a set of Airlift Airbags and I didn't want the rail install to interfere with the airbags. It was a good choice, there was no interference at all. If I had not had the bags, I would have chose the rails and install kit that require no drilling. Drilling the holes went very fast and easy, it was torking the rear bolts down that was very difficult. There was not enough room to get a wrench of any kind around the nut. I wound up using a set of vise grips on the nut while a friend of mine torked the bolt slowly from above.

All and all I'm happy with the product and I'll give another review in a year.
Harvey profile picture

Harvey

3/3/2020

This Demco 21K fifth wheel hitch is a great piece of equipment. I have pulled my 40 Heartland Bighorn fifth wheel as far north and west as Wisconsin and south and east as Florida. It has performed like I thought it should and beyond. I am sure glad that I chose the Recon over any of the more expensive brands. Its a real performer and it looks pretty cool too!

by:
I did have a problem the first time using the hitch with it unexpectedly sliding rearward and bending the locking pins. Kudos to Michael with Demco products for sending a replacement part and no issues since.
by:
2019 Ford F-350 Super Duty
I had a Demco Recon 5th Wheel Hitch in the past I liked how easy it was to operate and the get in and out of the truck bed. I also like how compacted it is compared to most of the other brands. Go with what you know works for you.
by:
I like it’s design and how it sits in the bed. It seems to want to rotate some while pulling. I see some reviews that other people are having this problem also. Some have put a bolt down through the base into the truck bed. I haven’t wanted to do that as of yet. Otherwise I like the hitch.
Kevin profile picture

Kevin

11/20/2023

Pretty good. Still rotating a little. I tightened the main bolt to the ball more than the 30lbs. It’s not rotating as much as it has been. Still haven’t figured out if or where I would drill a hole for a bolt to go in. I’m not really wanting to do that yet.

Mike L. profile picture
Etrailer Expert

Mike L.

11/22/2023

@Kevin I spoke with my contact in the Tech Services department at Demco about your issue. Here's what we advise: 1. Are you using a rotational pin box such as a Reese Revolution, Reese Sidewinder, Lippert Turning Point or Mor/Ryde Orbital? If so, do you have the rotational pin box operation locked out? In other words, we don’t want to stop the rotation of the king pin in the Demco hitch jaws to be stopped. 2. Are you using a lube disk on the trailer? From the photo, the hitch appears to be on a truck bed with a sprayed in bed liner. Some of those liners are actually slick and the steel on steel of the pin box skid plate on top of the hitch head skip plate is more resistance than the hitch to the truck bed is. Thus, causing the movement. Many times, just adding a lube disk will stop this movement. 3. The recommended torque setting of the coupler bolt is 30 ft pounds. You can adjust the torque to 40 or 50 ft pounds of torque on the coupler bolt. We recommend trying 40 ft pounds first and see if that stop the movement. If not increase to 50 ft pounds. 4. Generally, one of the above troubleshooting items will resolve the slight turning issues of the hitch in the truck bed. If not, the final solution Demco has would be to place a thin piece of rubber between the truck bed and the bottom of the hitch base. Once the rubber is in place and the hitch is re-torqued, the rubber will give the resistance needed to stop the base from turning in the bed of the truck.
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  • Best Fifth Wheel Hitch Recommendation for a 2015 GMC Sierra 2500 Short Bed
    Since you have a short bed truck you are going to need to get a slider fifth wheel hitch to allow you to make tight turns. Since getting out and operating the slider every time you get to a parking lot can be a bit of a hassle I would recommend the Demco Hijacker AutoSlide part # DM8550022. This hitch will automatically slide back when making tight turns. If you are looking for the best setup this would be it. The rail kit you would want would be the underbed kit part # DM8551010 that...
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  • Recommended Fifth Wheel Hitch Setup for 2017 GMC Sierra 3500 to Tow 2020 Keystone Fuzion
    The Curt Q20 5th Wheel Hitch # C16671 that you referenced is a great option to tow your 2020 Keystone Fuzion if you decide to have your GM dealership install their factory below bed rails. We have some great aftermarket options for you that you can get from us here at etrailer.com. Aftermarket systems are typically less expensive than factory options without sacrificing safety, capacity, or features. For a complete underbed rail 5th wheel system for your 2017 GMC Sierra 3500 Denali,...
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  • Can the Andersen Ultimate Be Used on a 2018 GMC Sierra 2500 Short Bed
    I do have an option for you but the Andersen Ultimate Connection 5th Wheel Trailer Hitch System part # AM3200 or any of them for that matter will not work on most short bed trucks like what you have on your 2018 GMC Sierra 2500 because they do not provide enough turning clearance even with the offset adapter but if you want you can measure for this using the attached help article. Therefore, the only option you have is a sliding 5th wheel hitch or a fixed hitch with rotating pin box but...
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  • Parts Needed To Install Demco Autoslide 18K 5TH Wheel Hitch On 2019 GMC Sierra 2500 With UMS
    Yes, you do have the correct part numbers. For your Demco Autoslide 5th Wheel Trailer Hitch # DM8550034 the Side Plates # DM6003 are the part number 6003 you referenced. To mount on the Underbed Rail and Installation Kit # DM8551010 for your 2019 GMC Sierra 2500 you will need the Side Plates # DM6004.
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  • Auto Sliding Fifth Wheel Hitch and Rail Kit for 2015 Chevy Silverado 2500HD
    Since there isn't a way to connect an automatic sliding fifth wheel hitch to a B and W Turnoverball gooseneck hitch you will have to remove your current hitch gooseneck hitch to accomplish this. The Demco Hijacker Autoslide part # DM8550037 is the hitch I recommend as it has a 21k capacity and slides automatically as you make tight turns like you are wanting. This hitch also installs to underbed rails which will leave your truck bed a more empty when not towing. The correct rail kit for...
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  • Will the Demco Hijacker Work with a MOR/ryde Pin Box
    Yes, the Demco Hijacker Autoslide 5th Wheel Trailer Hitch part # DM8550022 with the Underbed Rail and Installation Kit part # DM8551010 will fit your 2015 Chevrolet Silverado 2500 with the 6-1/2' bed and work with the MOR/ryde pin box you have on your 2018 Jayco Eagle 5th Wheel Trailer. However, in order to prevent the kingpin from rotating inside the hitch you will need to use a locking plate like part # DM6025.
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  • Best Kind of Truck and Hitch to Tow a 5th Wheel Trailer
    To start the best trucks for 5th wheel or gooseneck trailer towing are going to be 1-ton long bed trucks. With a short bed you can run into clearance issues when turning and additional equipment would be required in order to solve that problem. The best hitch for towing a given trailer is going to be the one that matches that type of trailer. So in other words the best hitch for towing a 5th wheel trailer is a 5th wheel hitch. So I do recommend removing the adapter that is on it and using...
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  • Estimated Installation Time For Demco Fifth Wheel Hitch And Installation Rail Kit
    Hey Clint, you are going to be installing the rail kit on the truck as well, correct? The Demco Recon 5th Wheel Trailer Hitch # DM47YV by itself should take only about 30 mins to assemble and install. The Installation Rail Kit # DM8551000 will also need to be installed on the truck. For the Installation Rail Kit, we estimate about 4.5 hours for installation. So, for the hitch and rail kit you would be looking at around 5 hours. You will find our install video linked below.
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  • How Much Does The Demco Recon 5th Wheel Trailer Hitch w/ Slider DM47YV Weigh?
    Hello Doug. The Demco Recon 5th Wheel Trailer Hitch w/ Slider # DM47YV weighs about 220 lbs. The slider base weighs 165 lbs and the head unit is about 55 lbs.
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Info for this part was:

Employee Lindsey S
Updated by:
Lindsey S
Employee Wilson B
Updated by:
Wilson B
Employee Michael B
Updated by:
Michael B
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R

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