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Rubber Grommet for 4" Round Trailer Lights - PVC

Rubber Grommet for 4" Round Trailer Lights - PVC

Item # A45GB
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Accessories and Parts A45GB - 4 Inch Diameter - Optronics
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This black PVC grommet allows you to flush mount your Optronics 4" round trailer light. Shock mount protection extends the life of the lamp. Recessed mount. Durable plastic construction. Call 800-298-8924 to order Optronics accessories and parts part number A45GB or order online at etrailer.com. Free expert support on all Optronics products. Guaranteed Lowest Price and Fastest Shipping for Rubber Grommet for 4" Round Trailer Lights - PVC. Accessories and Parts reviews from real customers.
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  • Reviews (125)
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Optronics Accessories and Parts - A45GB

  • Trailer Lights
  • Mount Parts
  • Optronics
  • Grommet
  • Round
  • 4 Inch Diameter

This black PVC grommet allows you to flush mount your Optronics 4" round trailer light. Shock mount protection extends the life of the lamp. Recessed mount. Durable plastic construction.


Features:

  • Grommet allows you to flush mount your Optronics 4" round trailer light
    • Designed to fit Optronics 45 Series lights (sold separately)
  • Shock mount design cushions light against vibration and jolting
  • Open back provides easy access when wiring
  • Light snaps into grommet for a finished look
  • Durable PVC construction
  • Recessed mount installation - hardware not included
    • Requires 4-1/2" cutout


Specs:

  • Outer diameter: 5-3/8"
  • Mounting depth: 1-1/16"


Optronics PVC grommet for 4 Inch Round Flush Mount Lights Diagram

Manufacturer Cross-Reference

Grommet will work as an exact replacement for:

  • Uni Bond GR4000
  • Wesbar 224088
  • Truck Lite 40700
  • Grote 91740
  • Peterson 426-18
  • Bargman 40-01-020


A45GB Optronics Rubber Grommet for 4" Round Sealed Trailer Tail Lights - Recessed Mount

Alternate part number: A-45GB




California residents: click here



Customer Reviews

Rubber Grommet for 4" Round Trailer Lights - PVC - A45GB

Average Customer Rating:  4.8 out of 5 stars   (125 Customer Reviews)

This black PVC grommet allows you to flush mount your Optronics 4" round trailer light. Shock mount protection extends the life of the lamp. Recessed mount. Durable plastic construction.

- A45GB
by:

Very satisfied 608103



- A45GB
by:

Working well the trailer is parked out in the weather all year and the grommets are not hard of cracking 910297



- A45GB
by: 10/30/2020

Prefect fit, quick shipping 906088



- A45GB
by:

880824



- A45GB
by:

awesome 894036



- A45GB
by:

high quality product very quick delivery website is easy to navigate great sekection of merchandise 878061



- A45GB
by:

USED etrailer FOR MY RV...EXCELLENT. GAVE THEM ANOTHER OPPORTUNITY FOR MY WORK TRUCK. etrailer DID NOT LET ME DOWN! RECEIVED MY ORDER AHEAD OF SCHEDULE. QUALITY EQUIPMENT AND SERVICE...NICE!!!! 864372



- A45GB
by:

Fast shipping and always have what I’m looking for. 863075



- A45GB
by:

best fitting light grommets I have yet to find. 853529



- A45GB
by:

Excellent. Everything was as ordered. Delivery was fast. 850104



- A45GB
by:

The product is being installed and I do not have any feedback on that. I did enjoy the ease of ordering and the prompt shipment. 821013



- A45GB
by:

The amber led lights I received were great and I installed them in the front of my 2002 Pontiac Firebird cuz I clipped another deer and ran over a raccoon in the same night and they took out my front lights again. So, rather than try to purchase an original set of turn signal and fog light assemblies along with the expensive bulbs, I converted it over to led and it is a great upgrade for an older car. The problem is that the three color coded wires came with no directions that told me which wire was ground, park, or turn. I had to figure it out as the color codes are different on my car. I would send a pic, but it is on my cellphone. 817096



- A45GB
by:

Perfect fit! 816260



- A45GB
by:

These lights could not be better. Worth the time and peace of mind to have a quality product that is bright and easy to see. 795484



- A45GB
by:

The price, quality, and service can't be beat. 787184



- A45GB
by:

Very pleased now other drivers can see my tail lights. Better yet turn signals & stop lights are bright .I would recommend these lights to any drivers that want to be safe on the highways 786248



- A45GB
by:

Fast service, everything fitted well- very pleases, will order again. 747599



- A45GB
by:

etrailer as always has what I need, ships fast, and product is "as advertised"! A pleasure to talk to the tech's when I have questions and even go as far as calling manufacturer to verify equipment selections. Keep up the GREAT work. 708050



- A45GB
by:

Looks good, should work, just haven't used it yet...... 700392



- A45GB
by:

Met our expectations. Very happy 675377



- A45GB
by:

Fast service...another good products...what more can a person ask for. 675072



- A45GB
by:

Quality products. Quick shipping. 674542



- A45GB
by:

Exactly as described and what I was looking for. 657306



- A45GB
by:

Perfect fit...etrailer does a great job, always! 655329



- A45GB
by:

Love your products , this my third orde r! 654242


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Ask the Experts about this Optronics Accessories and Parts

  • Dimension of Thickness for Optronics Rubber Mounting Ring A45GB
    The Optronics rubber mounting ring # A45GB will fit into the hole that is 4-1/2 inches round, but the thickness of the mounting ring is 1-1/16 inches in depth. So if your plywood panel accommodates this amount of depth, then this rubber mounting ring will work well for you.
    view full answer...
  • Size Hole Needed to Install 4 inch Trailer Taillight that is Flush Mounted
    When used with the # A45GB grommet, a 4-1/2 inch diameter hole is needed to flush-mount a 4 inch taillight.
    view full answer...
  • How Thick Of a Plate Will the Optronics Rubber Grommet for 4 Inch Round Lights Fit
    I went out to our warehouse to measure the seat of the # A45GB grommet that you referenced. It seems like it will be a tight fit for your 3/8 inch bumper. The grommet seat measures 0.24 inches. Another option for mounting a 4 inch round light on your trailer, instead of the bumper, is to use the Trailer Light Mounting Bracket # BK45BB. This may not work for your application, but it could also be modified to work how you need. This bracket will work well with the rubber grommet # A45GB.
    view full answer...
  • Parts Needed to Install 4-1/2 inch Diameter Light in Trailer
    Yes, all three of the parts you mentioned are what's needed to install a light assembly in a 4-1/2 inch diameter hole. The light part # ST45RB fits the # A45GB, and the pig tail part # A4PB is the correct one as well.
    view full answer...
  • What Size Hole is Required for Installing Black Rubber Trailer Light Grommet # A45GB
    We have actually had this question before and we determined that the Black Rubber Grommet, # A45GB, mounts in a 4 1/2 inch diameter hole. It is compatible with a light like # STL23RB. You will also need a wiring harness like # A47PB.
    view full answer...
  • Can Rubber Grommet and the Optronics Clearance Light be Used on 1/4 in Thick Aluminum
    Yes, the Rubber Grommet # A45GB and the grommet of the Sealed, Uni-Lite Mini LED Side Marker # MCL11RKB can be used on a 1/4 inch thick hole in aluminum.
    view full answer...
  • What Size Hole is Required to Install Optronics Grommet A45GB
    The grommet part # A45GB that you referenced requires a 4-1/2 inch diameter hole be cut to install. I looked up the light you mentioned and it is a 4 inch diameter light like what this is designed to fit. I attached an install video for you to check out as well.
    view full answer...
  • What is the Minimum Thickness of the Surface that Rubber Grommet A45GB Can Be Mounted To
    Rubber grommet # A45GB is 1-1/16 inches deep but the material you are mounting the light in does not have to be that thick. A minimum 3/16 inch should be sufficient. Metal (aluminum or steel) would be the preferred surface. Fiberglass and other similar materials can flex much easier which could result in the light popping out of the hole. But this is not likely if the hole is cut to the proper size (4-1/2 inch diameter).
    view full answer...
  • Hole Size Information Needed for Mounting Trailer Light Grommet A45GB
    It doesn't really have a wall thickness requirement. As long as the hole is 4-1/2 inch in diameter this will fit and work well. It is compatible with a light like # STL23RB. You will also need a wiring harness like # A47PB.
    view full answer...
  • Fog Lamps for Aftermarket Bumper on 2007 Toyota FJ Cruiser
    If the hole in your bumper is actually slightly larger than 4 inches in diameter, I have what might be the perfect solution for you. The Rampage Fog Lamp Kit, part # RA5083059 is specifically designed to be mounted into a Rampage aftermarket bumper. You didn't mention who manufactured your bumper, but I believe this product would be the closest thing we offer to what you're looking for. The lamp is Halogen, and would sit in opening of your bumper, but it would not mount with a grommet....
    view full answer...
  • Brightest Round LED Backup Trailer Light
    The Light Guide LED Backup Light # BUL603CB you referenced is certainly a nice, bright LED backup light, but the brightest is the GloLight LED Backup Light for Truck or Trailer # BUL101CB, as you can see by the accompanying photo. This light requires Grommet # A45GB and Right Angle 2-Wire Pigtail # A49PB. This does come packaged together with the GloLight LED Backup Light w/ Grommet and Pigtail # BUL101CKB. I have added links to video reviews for you as well which I highly recommend...
    view full answer...
  • Recommended Trailer Tail Lights for 4.25 Inch Opening
    The LED Trailer Tail Light # STL42RMB has screw mounting holes that are 4-1/4 inches on center. The smallest hole this light will fit is 4 inches. You will have difficulty mounting this light as your opening matches the mounting hole locations so you won't get proper hold. You may want to use the Rubber Grommet for 4" Round Trailer Tail Lights # A45GB along with the # STL55RB which won't use any screws to mount. You will also want the 3 wire pigtail # A45PB.
    view full answer...
  • 4 Inch Round Trailer Tail Light Cutout Size
    The closest to 4 inch round lights we have is the Optronics LED Trailer Utility Light # BUL43CB or Trailer tail Light # STL55RB which are actually 4-5/16" diameter x 1-15/16" thick. These are designed to fit the Rubber Grommet for 4" Round Trailer Lights - PVC # A45GB which requires a 4-1/2 inch diameter cutout. You will also need wiring pigtail # A47PB. If you are interested in the Optronics Trailer Tail Light - Stop, Turn, Tail - Incandescent - Round - Red Lens # ST40RB you asked...
    view full answer...
  • How to Remove Tail Light That Has Rivets Holding the Grommet in Place
    It all depends on how the light installs. If it is like the Optronics part # ST45RB that installs with the grommet # A45GB then you should be able to remove it without removing the grommet. You may need access behind the light to do this though. If your tail light is more like the Optronics part # ST40RB though where the grommet is part of the light then you will need to remove the rivets by drilling them out and then use new rivets or even screws to install the new tail light (or the...
    view full answer...
  • Replacement Round LED Trailer Tail Light for a Peterson Round Tail Light
    The Peterson part number # 420-15 that you referenced is a replacement lens for the Peterson Round Trailer Tail Light # 431800 which has a 3-3/4" diameter. Although we don't have an exact match to this in LED we do have slightly larger sizes of round tail lights that come as LED. If you are wanting to go with one from Peterson then we have the LED Trailer Light # M826R-7 which has an overall diameter of 5-1/2" but the light diameter is only 4-1/4". The grommet # 426-18 and 3-prong plug...
    view full answer...
  • Flush Mount, Submersible LED Back Up Light Recommendation for a Trailer
    The brightest LED light, flush mount, submersible, that can be used as a back up light, is going to be the round light # BUL23C24B. But this is a 24 volt light and it has 27 diodes. For a 12 volt back up light that is flush mount and submersible would be # BUL10CB or # BUL11CB. For the BUL10CB that you have referenced, you will also need grommet # a70gb, and a wiring harness # A49PB. For the round light # BUL11CB, you would need grommet # A45GB. and harness # A45CB.
    view full answer...
  • Replacement Tail Light For Forest River Georgetown XL RV
    I'd be happy to assist you. It sounds like you need the Sealed, Flush Mount Tall Rectangle LED Trailer Stop, Turn and Tail Light, Grommet and Plug, 12 Diode # STL34RB but most of the pictures I see have round tail lights like the Sealed, 4" Round, LED Stop/Turn/Tail light, 21 Diode - Red # STL55RB. If this is not the correct part, then send me a photo with the measurements of the light and we will get you what you need. The numbers and letters that are actually printed on the light...
    view full answer...
  • Are LED Lights with More Diodes Brighter and Can a Trailer Backup Light be Used on a Truck
    It is pretty safe to assume that the more diodes in an LED light the brighter it will be. The only time that is not necessarily true is if one light has large diodes and the other doesn't. But any way you slice it light # BUL53CB and its 36 diodes is going to be bright. In this case, for all intents and purposes, a 4-5/16 inch and 4-1/4 inch diameter won't make a difference. The light can be used on your truck. In fact a lot of people use lights like this and other trailer lights...
    view full answer...
  • Trailer Wiring and Lighting Replacement for Trailer with 4.5 inch Red and 2.5 inch Amber Light
    For a 4-1/2 inch diameter trailer taillight that can do stop/tail/turn functions we have the part # STL43RB which would work well. For a rubber grommet then we'd need the part # A45GB. Then for a pigtail harness you'd need the part # A47PB. For the 2-1/2 inch amber lights you'd want the part # MCL59AB and for a grommet for this you'd need part # A55GB. For a pigtail for this you'd want part # A46PB. Then for 4-way wiring sold by the foot you'd want the part # 16-4B-1.
    view full answer...
  • 2 and 4 Inch Diameter Trailer Lights, Grommets, and Harnesses
    I will be happy to help and give you some options. For 2 inch diameter red lights we have several options: # MC53RB (use grommet # A54GB and harness # A46PB) # MCL50RB (use grommet # A54GB and harness # A46PB) # MCL55RB (use grommet # A54GB and harness # A46PB) # MCL55R1224B (use grommet # A54GB and harness # A46PB) All in one option # MCL-50CRK # MCL155RB (use grommet # A54GB and harness # A46PB) For 2 inch diameter amber lights we also have several options: # MC53AB (use...
    view full answer...
  • Replacement Tail Light for 2009 Ranger Boat Trailer
    Sometimes it is possible to replace a broken trailer light with one that uses a different type of installation but since we offer a very wide range of lights you may very well be able to find an exact OEM-style replacement. It sounds like you have a light like # STL42RB which has a 3-hole mounting flange. I linked our main page for trailer tail lights of all shapes and sizes. On the page you can simply click on the filters for light shape, light type (LED or standard bulb), lens color,...
    view full answer...
  • Recommendation for 24 Volt Trailer Lights
    We do have some lights that are designed to work on a 24 volt system but none that are available in a kit. I recommend using light # STL23R24B. There are a few ways to mount this light. You can use a grommet and flush mount it using # A45GB. Or you can surface mount it with a bracket, # BK45BB. You will also use a wiring harness, # A47PB.
    view full answer...
  • Will Optronics GloLight LED Tail Light # STL101RB and Grommet Fit 4-3/8 Inch Cutout
    The GloLight LED Trailer Tail Light # STL101RB referenced in your question, when used with the Rubber Grommet # A45GB, is designed to fit a 4-1/2 inch cutout on the trailer. Since your opening is just a tiny bit smaller at 4-3/8 inches, you should have no problem fitting the grommet on your trailer and you shouldn't have to make any additional modifications. I have attached a couple short video demonstrations on these products that you can also check out.
    view full answer...
  • Installation Assistance With Mounting Hole Dimensions Optronics GLOLight LED Stop/Turn/Tail Light
    To install the Optronics GLOLight LED # STL101RMB you will also need grommet # A45GB. There are two mounting options for this LED light. The first one is using Optronics grommet # A45GB and mounting directly into your 1998 Jeep Wrangler. The other option is using the Optronics Mounting Bracket # BK45BB. If you decide to use the mounting bracket, you will still need the grommet as well. If you are mounting using the grommet only the grommet opening is 4-1/2 inches. When cutting...
    view full answer...
  • Difference Between Grommets # A45GB and # A45GNB
    The difference is that the grommet part # A45GNB has a notch cut in the lower portion that seals to the mounting hole. This allows the grommet to install a bit easier than the part # A45GB.
    view full answer...
  • Are Optronics Stop/Turn/Tail Led Lights With Clear Lens Brighter Than Lights With Red Lens
    The 4 inch trailer lights like part # STL101RMB or part # STL101RCMB contain 21 LED diodes. The # STL101RCMB will appear to be brighter due to the fact that the other light has a red lens and the light output is diffused. Both lights have the same number of diodes and feature the stop, turn, and tail light functions. When mounting these lights the rubber grommet needed is part # A45GB. Each of these lights requires the 3-wire pigtail when installing. For a straight pigtail you...
    view full answer...
  • Flashing Amber Warning Light for Agricultural Equipment
    For an amber agricultural light I recommend # W8260601 which was designed for this purpose. You could add # W002515 to wire it up. We also have amber flashing warning lights like # SLL43AB1 and # SLL43AB2 that can be wired to flash alternately. You would also need harness # A45PB for each and a grommet to mount them # A45GB. I have included a video review of these lights for you. The Optronics light # STL51AB you referenced is designed as a parking and turn signal light rather than...
    view full answer...
  • Are there Replacement Tail Lights for a 1982 Scamp Trailer
    In order to determine which replacement lights will fit your 1982 Scamp trailer, you will need to find the manufacturer and model number of the light assembly. This could involve removal of the assembly. If you see numbers on the lens, those are not the correct numbers. If you cannot find any manufacturer/model number information, you will need to measure the diameter of your existing tail lights and any other dimension that you can. You will also need to determine how they mount to...
    view full answer...

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Info for this part was:

Expert Research:
Jackie C
Expert Research:
Mike L
Expert Research:
Michael H
Expert Research:
Jameson C
Video by:
Andrew K
Installed by:
Kathleen M
Updated by:
Rachael H
Updated by:
Brian T
Video Edited:
Chad S

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