2-1/2" Round Grommet - Recessed Mount - Open Back

2-1/2" Round Grommet - Recessed Mount - Open Back

Item # A57GB

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  • Trailer Lights
  • Mount Parts
  • Grommet
  • Optronics
  • Round
  • 2-1/2 Inch Diameter
Rubber PVC; shock mount protection; recess mount w/2-3/4" mounting hole; open back for wiring Call 800-298-8924 to order Optronics accessories and parts part number A57GB or order online at etrailer.com. Free expert support on all Optronics products. Guaranteed Lowest Price and Fastest Shipping for 2-1/2" Round Grommet - Recessed Mount - Open Back. Accessories and Parts reviews from real customers.


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  • Reviews (21)
  • Q & A (17)
  • Videos (1)
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Optronics Accessories and Parts - A57GB

Rubber PVC; shock mount protection; recess mount w/2-3/4" mounting hole; open back for wiring


2-1/2" Round Grommet - Recessed Mount - Open Back

A round, black PVC grommet needed for recess mounting 2-1/2" round sealed lights. The grommet has an opening in the back to allow for the necessary wiring. This rubber grommet gives shock mount protection that extends the life of the lamp. A 2-25/32" mounting hole is required for the grommet. Along with the sealed light, a two-wire pigtail is required to complete the installation.

  • Rubber grommet for recess mounting 2-1/2" round lights
  • Open back for easy wiring access
  • Shock protection extends lamp life
  • Requires a 2-25/32" mounting hole

Manufacturer Cross Reference
Grommet will work as an exact replacement for:
Uni Bond # GR2502
Truck Lite # 10700
Grote # 91400
Peterson # 143-18

Manufacturer Specifications

Black PVC grommet allows 2-1/2" diameter sealed lights to be recessed mounted. Provides shock mount to lengthen lamp life. Requires A46PB or A49PB for electrical connection. 2-25/32" mounting hole required.

dimensions of grommet


A57GB 2-1/2" Open Back Recessed Mount Rubber Grommet by Optronics, Inc.

Alternate part number: A-57GB







Video of 2-1/2" Round Grommet - Recessed Mount - Open Back


Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Optronics Trailer Lights A57GB Review

Speaker 1: Today we're taking a look at the Apptronics 2 1/2 inch round grommet for trailer lights. This rubber grommet is designed for recess mounting, a 2 1/2 inch round trailer light. You'll notice that is has the open back design for easy wiring access. It also the side areas where you can route wiring. This grommet provides road shock protection, which is going to really help extend the life of your trailer light. And when installing this, it does require a 2 and 25 32nd inch mounting hole for the installation and the overall depth of the unit measures about 1 1/8 of an inch deep.

It's made from a durable rubber construction. And again it is designed for a 2 1/2 inch round trailer light. You place it in, and you just work your way around until it seats all the way. And then that's what it looks like. Gives you a really nice clean finished look to the trailer light and then you have the open back for easy access for the wiring connections.

That's going to do it for today's look at the Apptronics 2 1/2 inch round grommet for trailer lights.


Customer Reviews

2-1/2" Round Grommet - Recessed Mount - Open Back - A57GB

Average Customer Rating:  4.9 out of 5 stars   (21 Customer Reviews)

Rubber PVC; shock mount protection; recess mount w/2-3/4" mounting hole; open back for wiring

- A57GB
by:

Fits perfectly, replaced original grommet because of being torn and the original light no longer working. The light and Gromit was ordered, and received on time . 672856



- A57GB
by:

Worked great. 652688



- A57GB
by:

Timely, correct description, complete The way E-commerce should strive to be - 528372



- A57GB
by:

Broke one of my warning lights and stretched out the rubber grommets. Perfect fit and matched my existing lights like nothing ever happened. Awesome price and was delivered quickly. You have a customer for life thank you. 461615



- A57GB
by:

Good product, extra fast shipping...... 447050



- A57GB
by:

The lights are fine but the 2 1/2" grommets are too small for PJ trailers. Had to reuse the old ones. 404814



- A57GB
by:

etrailer had exactally what I was looking for. Their web site is very helpful. I received the order quickly. 396386



- A57GB
by:

Just what I needed. Perfect replacement. Great service and the website made ordering easy. 372581



- A57GB
by:

Great product, customer service and fast shipping. Will be a returning customer. 371756



- A57GB
by:

Great price and good product 324959



- A57GB
by:

Quick, fast and easy!! Not to mention good quality. Really like the up to date tracking feature. Keep up the good work! 319973



- A57GB
by:

Exact replacement for the damaged ones on my PJ gooseneck trailer. Seem to be very nice quality for the price and were simple to replace. 288010



- A57GB
by:

This grommet fit perfectly and replaced the original one on the trailer. 274995



- A57GB
by:

The Grommets are perfect for my need. I had just bought a new utility trailer and 3 of grommets were damaged during installation and I wanted to replace the damaged grommets and this was the easiest way to accomplish that. 206839



- A57GB
by:

Everything worked great, would do it ag ain! 201481



- A57GB
by:

No problem with fit. Worked just like orignal 161382



- A57GB
by:

Worked like it should. 160140



- A57GB
by:

As expected. Happy with it. 122661



- A57GB
by:

Very please with product and would order again. 110645



- A57GB
by:

All the items were excellent quality, well packed, and worked perfectly. Will definitely order again if I need anything else for my trailer. 107948



- A57GB
by:

Heavy duty and durable makes an excellent addition to creating the ultimate flush mount lighting configurations.. Most definitely pleased! 88945


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Ask the Experts about this Optronics Accessories and Parts
Do you have a question about this Accessories and Part?


  • Can Optronics Sealed 2-1/2 Inch Light be Mounted in a 2-7/8 Inch Hole
  • In order to install this light, you will need a grommet to fit the hole. We have a grommet for a 2-25/32 hole, which is just under 2-7/8 as well as a grommet that fits a 3 inch hole. If you can re-measure the hole with something that has 16th inch or 32nd increments we can get a more accurate measure of the hole. If it is a 2-25/32 inch hole, you would use grommet # A57GB. If you find it is a 3 inch hole, you can use part # A55GB. Both of these grommets will work with the MC57AB.
    view full answer...

  • Can a 2-1/2 Inch Round Surface Mount Trailer Light be Mounted Using a Grommet Instead
  • Technically you could use grommet # A57GB with trailer light # MC58RB. However the light was meant to be attached to a flat surface. The recessed mount version is # MC55RB and you would use grommet # A55GB. This set up actually costs a little less though the light requires pigtail # A46PB.
    view full answer...

  • Recommended Clearance Light And Grommet For Older Snowmobile Trailer Rebuild
  • The clearance light I recommend for your snowmobile trailer is part # MCL57RB. This is a 3 diode 2-1/2 inch round light. It does require a rubber grommet for installation. The grommet to use for installing this light I recommend is part # A57GB. You may need to take a small round file and open the mounting hole you said measured about 2-5/8 inches but this should work well for your trailer. To connect the light to your trailer wiring I recommend using the Two Wire Pigtail, part...
    view full answer...

  • Replacement Amber Clearance Light for Dutchman Kodiak
  • The lenses on clearance lights are not generally removable as they are often "sonically sealed" such as the Optronics Trailer Clearance or Side Marker Light # MC57AB; this means they are submersible. Instead of buying a light and taking the lens off I strongly recommend an LED Trailer Clearance or Side Marker Light w/ Reflex Reflector # MCL59AB for your Dutchman trailer because an LED is a far better, much longer lasting option. You only need to make sure your existing lights have the...
    view full answer...

  • Trailer Clearance Light Recommendation to Fit 2-3/4 inch Diameter Hole
  • For a grommet that fits the diameter hole of 2-3/4 inches we have the part # A57GB which fits lights that are 2-1/2 inches in diameter like the Miro-Flex LED Trailer Clearance or Side Marker Light # MCL51RB. You'd need these two things plus a wiring pigtail part # A46PB and you'd be set.
    view full answer...

  • Rubber Mounting Gasket for Optronics Round Trailer Clearance Side Marker Light # MC57RB
  • There is indeed a rubber mounting grommet available for use with the Optronics Round Trailer Clearance Side Marker Light # MC57RB that you referenced. The part you will need for use with this light is part # A55GB. This grommet provides a degree of shock-mounting for the light and allows flush-mounting. It provides an open back for convenient wiring access. We also offer grommet # A57GB that allows recessed-mounting in a 2-3/4-inch mounting hole.
    view full answer...

  • Can the Optronics 2-1/2 Inch Flush Mount Trailer Light # MC57RB be Surface Mounted
  • The Optronics 2-1/2 Inch Flush Mount Trailer Light, # MC57RB, requires a grommet and 2 wire plug, # A46PB, and is not designed to be surface mounted. The 2 wire plug would interfere from surface mounting the light. Instead, you could use the Heavy-Duty Metal Mounting Bracket, # BK55BB, and grommet, # A57GB. This mounting bracket will allow you to mount the light without having to drill a 3 inch hole in your trailer and the light will sit in the grommet securing it to the bracket. Another...
    view full answer...

  • Marker Light to Replace Peterson 143 on 2007 Fleetwood Pop Up Camper
  • I did some research, and found that the Peterson 143 is a flush grommet mount lamp, not a flange mount. The lamp itself is 2-1/2 inches in diameter. The Optronics # MC57AB would be a comparable replacement. You'd also need a # A57GB grommet and a # A46PB pigtail. If the # MC57AB doesn't match your lamp, please send me a reply email with a photo of the lamp attached, and I'd be happy to try to find a replacement for you.
    view full answer...

  • Recommended Grommets Brackets And Plugs For 2 Inch LED Utility Light
  • For the Optronics Clear LED Round Utility Light, part # UCL55CB, the grommet and brackets are different than those you listed. I will list the correct items you need for this light. The grommet needed for this light is part # A54GB. The mounting bracket designed for this light is part # BK5557GB. The two-pin plug you need for this light is part # A46PB. Part # A57GB and part # BK55BB are designed for a 2-1/2 inch light and will not work with the 2 inch light you referenced.
    view full answer...

  • Recommended Trailer 2-1/2 Inch Clearance Light and Grommet
  • The closest grommet we carry to your 2-11/16 inches hole is the Optronics # A57GB. This is made to fit into a 2-25/32 inch opening which is going to be extremely close. Being that it's rubber I would imagine you could make it work even if you have to file out the hole ever so slightly. For a 2-1/2 inch submersible LED light the Optronics # MCL59RB will pair well with the 2-Wire Pigtail # A46PB.
    view full answer...

  • Availability of Mounting Bracket for 2-1/2 Diameter Round Sealed Trailer Lights
  • We do indeed have a bracket designed for 2-1/2 inch diameter trailer lights, part # BK55BB. You would also need the rubber grommet, part # A57GB. The bracket and grommet would work with a 2-1/2 inch diameter lamps like part # MC57RB or # MC57AB.
    view full answer...

  • Availability of a Flush Mounted 2-1/2 inch Diameter GLO Light Led Trailer Light
  • The Optronics GloLight # MCL157RB that you referenced is designed to be recess mounted with the Recess Flange # A57GB. While it wouldn't quite be as flush mounted as the Optronics GLOLight LED Stop/Turn/Tail Light # STL101RFMB that you also have it would look pretty good on your trailer. For a very similar 2-1/2 inch LED light that is designed to be flush mounted check out the # MC57RB. For a flush mounted grommet you would want part # A55GB.
    view full answer...

  • Is the Heavy Duty Light Bracket # BK55BB Compatible with Optroncs Glolights
  • Yes, the Heavy-Duty Metal Mounting Bracket # BK55BB that you referenced would work with the Optronics Glolight Amber # MCL157AB or the Optronics Glolight Red # MCL157RB but you will need a grommet as well. For that you would want a Round Grommet # A57GB. For wiring up the lights you will want a Two Wire Pigtail for Sealed Trailer Clearance, Side Marker Lights # A46PB.
    view full answer...

  • What Pin on the Hopkins Endurance 4-Way Flat Trailer Connector Is For Side Marker Lights
  • If you take a look at the attached photo of the Hopkins Endurance 4-Way Flat Trailer Connector part # HM48110, you will see a two letter code for each terminal. The correct terminal for the clearance/side marker lights is shown as "TM" which is a black/brown wire. In regards to wire gauge, you will not have any issues using a 16 gauge wire from the lights to the 18 gauge wire on the trailer connector. The Fusion LED Trailer Tail Light - Stop, Tail, Turn, Backup part # STL211RB that you...
    view full answer...

  • Red Beehive Marker And Clearance Light In 2-1/2 Inch Round
  • The Beehive Side Marker and Clearance Light w/ Mounting Bracket, 1 Wire - Amber # MC21AS is the only light that comes with the bracket. If you want a red light in the same size, we have the Sealed LED, Beehive Trailer Clearance, Side Marker Light, 2-1/2" Diameter - Red # MCL23RB that can be flush mounted using # A55GB or recess mounted using # A57GB. If you want a recessed mount, you can use the Heavy-Duty Metal Mounting Bracket for 2-1/2" Round Clearance Lights # BK55BB for these...
    view full answer...

  • Looking for Trailer Clearance Light to Fit 2-5/8 Inch Rough Opening
  • I'd recommend the # MCL59RB for red or # MCL59AB for amber. The lamps are sealed and are waterproof, perfect for a snowmobile trailer. Each LED lamp is 2-1/2 inches in diameter. With the lamp, you'd use the # A57GB grommet, which requires a 2-25/32 inch hole, which is about .156 of an inch larger than the 2-5/8 inch hole you referenced. If your 2-5/8 inch measurement is right on the mark, it would take just a few moments with a Dremel or a round file to slightly enlarge the existing holes...
    view full answer...

  • Is GloLight LED Trailer Clearance or Side Marker Light P2 Rated
  • I checked with Optronics and can confirm that the GloLight LED Trailer Clearance or Side Marker Light # MCL157RB is P2 rated. To mount this light you can use the 2-1/2" Round Grommet # A55GB for flush mount or 2-1/2" Round Grommet # A57GB for a recessed mount. It will require 2-Prong Plug # A46PB. The GloLight LED Trailer Clearance or Side Marker Light # MCL157RB is red although there is also an amber version of the exact same light at part # MCL157AB. I have added links to video...
    view full answer...


Do you have a question about this Accessories and Part?




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Info for this part was:

Expert Research:
Jameson C
Updated by:
Laura H
Installed by:
Cole B
Updated by:
Rachael H
Updated by:
Brian T

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