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Optronics

Optronics Trailer Clearance or Side Marker Light - Submersible - Incandescent - Round - Amber Lens

Part Number: MC57AB

2622 Reviews | 17 Questions

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Retail:$7.89

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optronics trailer lights marker 2-1/2 inch diameter mc57ab

optronics trailer lights clearance marker or side light - submersible incandescent round amber lens

optronics trailer lights clearance submersible mc57ab

optronics trailer lights clearance 2-1/2 inch diameter

optronics trailer lights marker submersible mc57ab

optronics trailer lights clearance 2-1/2 inch diameter or side marker light - submersible incandescent round amber lens

optronics trailer lights clearance marker

optronics trailer lights submersible 2-1/2 inch diameter mc57ab

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All You Need to Know About the Optronics Trailer Clearance or Side Marker Light

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2-1/2" Diameter round. Waterproof, incandescent trailer light serves as a clearance or side marker light when properly mounted. Built-in reflex reflector. Recessed mount with grommet (sold separately). Accepts standard 2-prong plug. P2 rated. Great Prices for the best trailer lights from Optronics. Optronics Trailer Clearance or Side Marker Light - Submersible - Incandescent - Round - Amber Lens part number MC57AB can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.

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Optronics Trailer Lights - MC57AB

Highlights

Reliable In Any Weather: Sonically sealed waterproof housing keeps moisture out for lasting use.
Easy Fit With Grommet Mount: Installs in a 3" hole using 2-1/2" grommet # A55GB for a clean setup.
Bright Amber Visibility: P2 rating delivers a clear 90° beam for safe clearance or side marking.
Simple 12V Connection: Accepts standard 2-prong plug # A46PB or # A86PB for quick wiring.
Durable Build: Polycarbonate lens and housing resist impact and wear.
Road Legal: DOT compliant to meet trailer lighting standards.

Features to know about

Reliable Lighting in Wet Conditions: Sonically Sealed and Submersible Design

When your trailer sees water, this light is built to handle it. The Optronics 2-1/2" round light uses a sonically sealed housing and lens to form a single waterproof unit. That construction keeps moisture out so the incandescent bulb stays protected, even when the trailer is submerged. It’s a dependable setup for trailers that deal with rain, spray, or full submersion.

Simplifying Visibility and Compliance: Dual-Purpose Clearance or Side Marker Light

Staying visible and meeting lighting requirements is easy with this P2-rated setup. It projects light at a 45-degree angle to either side of center for 90 degrees of total coverage, letting it serve as a clearance or side marker light when properly mounted. The built-in reflex reflector eliminates the need for a separate reflective piece, making installation cleaner while keeping your trailer visible from the front or rear.

Easy Mounting in Tight Spots: Recessed 2-1/2" Round Fit

A compact 2-1/2" diameter and 11/16" thickness make this light ideal for recessed installations. It fits a 3" rough opening when used with the Optronics A55GB rubber grommet, and it accepts a standard 2-prong plug like the A46PB or A86PB. That means no custom wiring or bracket work—just a snug, professional fit in the right-sized hole.

Durable and Serviceable: Polycarbonate Build with Replaceable Bulb

Built from tough polycarbonate, both the housing and amber snap-on lens stand up to road wear and vibration. If a bulb ever goes out, you can easily replace it without replacing the entire unit. The light draws only 0.2 amps at 12.8V on standard DC systems and comes backed by a 3-year warranty for extra peace of mind.

Specs

Dimensions

Overall diameter: 2-1/2"
Thickness: 11/16"

Technical diagram of Optronics MC57AB round amber trailer clearance and side marker light showing 2-1/2 inch diameter and 11/16 inch thickness for installation reference.

Electrical

Bulb type: incandescent
Power draw at 12.8V: 0.2 amps
Voltage: 12V DC

Ratings and Compliance

DOT compliant: Yes
P2 rated: Yes

Warranty

Warranty: 3-Year warranty

Manufacturer Cross Reference

Uni Bond #: SR2500A
Wesbar #: 223223
Truck Lite #: 10205Y
Grote #: 45813
Peterson #: 143A

MC57AB Optronics Trailer Clearance or Side Marker Light - Submersible - Incandescent - Round - Amber Lens - P2 Rated

Alternate part number: MC-57AB

Customer Satisfaction Score:

93% were satisfied with this product

7% of customers were not satisfied

Wrong item was ordered

7% of customers were not satisfied

Wrong item was ordered

4.9

2622 reviews

5 Stars		(2382)
4 Stars		(180)
3 Stars		(34)
2 Stars		(10)
1 Star		(16)

by: Jg 12/20/2017

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.

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by: Gretzky 09/09/2025

Exact replacement for the side marker lights on my boat trailer.

by: Christopher 03/23/2026

Got my light, put it on, it works great! Thanks

by: Lee k. 08/02/2016

Received part in great time.
Part looks just as good as original lamp

Click to Enlarge

by: Joe B 10/03/2017

E trailer did a fantastic job.
Before order: Technical support / help was excellent.
Goal, conversion of a 1998 Floe snowmobile trailer from surge to electric brakes.
Problem, due to time and corrosion, I could only supply partial part numbers, spindle diameter.
etrailer did a fantastic job, researching, and getting me the correct part numbers, so I could order.
Julie did a great job.
She was very timely, communicated clearly and honestly, and just “kept me in the loop”.

I received the order came on the projected date, complete and undamaged. Excellent.
I would highly recommend etrailer, for your part needs.

by: John 07/31/2025

Perfect match
Fleetwood 2022 bounder

by: Dj 05/13/2020 One Year Later

Fit on my 2004 Winnebago perfect as a front overhead marker light. Works great.

Dj One Year Later

5/14/2021

Still working fine!!

Dj One Year Later

5/14/2021

Still working fine!!

by: Ralph 11/24/2014

This is the replacement for what came from the factory. The lights are cheap and easy to replace. Just pop it out and unplug. etrailer was the first place I found this item. Always had good luck with etrailer.

by: Kevin 04/13/2018

Exactly what I needed. The websites showed me the breakdown of the part (exact size measurements) and I was able to order the correct replacements that I needed. Shipping was also very fast.

by: Brent 05/13/2023 One Year Later

Looked the same but did not fit my Forrest River Travel Trailer

Jenny N.

5/17/2023

I would like to help see if we do have the light that you need, This light was a 2.5 inch diameter recessed light. What size did you need?

by: Rich W. 06/23/2014

I got this light in the mail, opened it, popped it in the rubber grommet plugged it in and my light problem was over.
Great price for this light. My local auto part store wanted $7.95 for a 2" light.
Great light,, great deal...Highly recommend.

by: North Georgia Fence Co. 11/03/2023 One Year Later

I was easily able to locate the trailer lights I required on this excellent website. Delivery was fast and the product was excellent. Thank you!

by: George C. 04/20/2015

2015 Ford F-250 Super Duty

Equal to or better than the same lights available locally, but at half to 1/3 of the local prices. Even paying shipping I save a lot. Delivery with E-Trailer is always timely, too.

by: DCP 07/12/2017

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

by: Jerry 12/08/2023 One Year Later

Items were as described, fast shipping and thank you Matt for your assistance

by: Tony G. 10/09/2016 One Year Later

Bought a few of these to carry in all vehicles just to keep us legal. Excellent price, excellent value.

by: Ken S 02/10/2021 One Year Later

I don't want to be that guy who thinks that a couple of lights working on my trailer is good enough. Thanks for being there with all the right parts.

by: Jake 03/17/2015

2006 Chevrolet Silverado

Quality product. Was as advertised and shipping was very fast as usual.

by: Arne 07/20/2018

2017 Ford F-150

this is a great product, original equiptment priced $15.00 lower than other suppliers. I received the light in a couple of days and will use etrailer again. thanks guys

by: David 04/29/2016

Fair shipping cost, Great prices and quick delivery.

by: Dave 02/19/2014

Just what I needed to get my snowmobile trailer well lit again.

by: Patrick 12/12/2017

Good product, in timely fashion for standard shipping, Thanks.

by: Andy S 08/10/2014

Very good price and fast delivery. I live in an area where it is almost impossible to find many of the things I need. Your company is just the ticket, Thanks

Andy S. One Year Later

8/14/2015

I am still impressed with your units

by: DaveB 09/14/2015

Exactly what I needed. Fast shipping. Thanks

by: Benny 11/13/2017

A very good product and very fast shipping !

2622

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Show More Reviews

See what our Experts say about this Optronics Trailer Lights

Do you have a question about this Trailer Light?

What Size Hole is Needed to Mount Optronics 2-1/2 Inch Side Marker Light with Reflector and Grommet
The Optronics Sealed 2-1/2 Inch Round Trailer Clearance, Side Marker Light # MC57AB along with the Round Grommet - Floush Mount # A55GB will require you to cut a 3 inch diameter mounting hole. You will also need the Right Angle 2-Wire Pigtail Plug # A46PB to pair with the female connection on the Optronics light. I have attached video reviews of these products for you to look at.
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...
Replacement Clearance Light for my 2004 Winnebago Minnie Winnie
The Optronics Trailer Clearance or Side Marker Light part # MC57AB can be used with or without a grommet it is a standard size type light that can be utilized many different ways. As for the pigtail as you said in theory should be there but it always varies and in some cases it won't be there. I would pick one up and add it regardless just to make changing it in the future much easier if need be. The Right Angle 2-Wire Pigtail for Optronics Trailer Lights part # A46PB is the one to use.
view full answer...
What Is Hole Size For Mounting 2 Inch Round Trailer Lights With Rubber Grommet
The item you selected, Sealed 2-1/2 Trailer Light, part # MC57AB, is a 2-1/2 inch light that will mount into a 3 inch hole using 2-1/2 inch grommet, part # A55GB. The hole size to mount a 2 inch round light flush mounted would be 2-5/16 inches. The grommet you would need for a 2 inch light would be 2 Inch Round Grommet, part # A54GB. If you are flush mounting your lights, the 2 inch light will sit inside the grommet. A 2 inch light similar to the one you selected is part # MC53AB. We...
view full answer...
What Size Hole Is Needed For Mounting Optronics Trailer Light, # MC57AB, In A Rubber Grommet
To mount the Optronics Trailer Light, # MC57AB, in a rubber grommet you would use the Optronics 2-1/2 Inch Round Grommet - Flush Mount, # A55GB. This grommet will require a 3 inch mounting hole. To mount the Optronics Miro-Flex, Sealed, 4 Inch Round, Stop/Turn/Tail Light Trailer Light, # STL23CCRB, in a rubber grommet you would use the Optronics Rubber Grommet for 4 Inch Round Trailer Tail Lights, # A45GB. This will require a 4-1/2 inch mounting hole.
view full answer...
What Size Hole Drilled to Install the Side Marker Light Part # MC57AB with Round Grommet # A55GB
The recommended grommet to go with the Side Marker Light Part # MC57AB that you referenced is the Round Grommet # A55GB which will require a 3 inch hole.
view full answer...
What Amber Clearance Marker Will Fit an ATV Trailer With 2.5" Hole?
The grommets we carry jump from a 2-5/16" hole # A54GB to a 2-3/4" hole # MCL51CAK with the Grommet # A55GB for the Light # MC57AB you found requiring a 3" hole. You would want to reverify the diameter of your hole, enlarge the hole or look at a surface mounted light like the # MCL58AMFB which will cover the hole.
view full answer...
Replacement Boat Trailer Lights for 2-3/4" Rough Cutout and 2-1/4" Grommet
I have a solution for you, but we do not have any replacement lights that will fit in those grommets. Instead, you can use the LED Clearance or Side Marker Light # MCL002AXB (amber) and # MCL002RXB, which require a rough cutout dimension of 2-3/4", so they'll fit in your existing holes and provide you with the light solution you're looking for. These are waterproof LED lights so they're the perfect solution for a boat trailer as long as the rest of your lights are already LED. If your...
view full answer...
2-1/2 Inch Amber Clearance Light Recommendation for Trailer
For an amber clearance light that is 2-1/2 inches in diameter that uses a grommet for installation you would want the part # MC57AB. For a grommet you would want the part # A55GB and then for a pigtail part # A46PB.
view full answer...
Looking for Trailer Clearance/Marker Light to Replace Trucklite Model 10
According to my research, I have found that the Trucklite model 10 clearance/side marker light measures 2-1/2 inches in diameter. Because the Optronics # MC53AB measures 2 inches in diameter, it would not be a good replacement. The Optronics # MC57AB, with its 2-1/2 inch diameter, would be the correct replacement. If you need a mounting grommet, it is available as part # A55GB. The two pin wiring pigtail is also available as part # A46PB.
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...
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...
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 Rubber Grommet to Install Round Trailer Lamp in 3 Inch Rough Opening
We don't have a grommet that will secure a 2 inch lamp in a 3 inch rough opening, but the Optronics # A55GB rubber grommet will work with a 2-1/2 inch diameter lamp like the # MC57AB you'd looked at. The 2-1/2 inch diameter lamp is also available in red as part # MC57RB. Each lamp would use a # A86PB pigtail, which is sold separately.
view full answer...
Availability Of 60mm Amber Clearance Light That Installs In Grommet
The closest option we have is the Optronics Trailer Clearance or Side Marker Light - Submersible - Incandescent - Round - Amber Lens # MC57AB which is 2-1/2" diameter and 11/16" thick as shown in the included diagram. The # MC57AB installs into a 2-1/2" rubber grommet like the # A55GB, and uses 2-wire pig tail # A46PB. I included videos for each of the products mentioned for you to take a look at.
view full answer...
Diameter of Rough Opening Needed for Optronics MC57AB Trailer Clearance/Side Marker Light
The lamp you've looked at, part # MC57AB is designed to be mounted in a 3 inch diameter rough opening. The lamp is designed to be used with a grommet, part # A55GB. You'd also need a # A86PB wiring pigtail. If you would reply with the dimension of the rough opening in the trailer where the light would mount, I'd be happy to make a suggestion. I've linked you to product description videos for the lamp, grommet and wiring pigtail.
view full answer...
Replacement Clearance Light with a Reflective Lens for a Horse Trailer
The Optronics light, MCL71AB, does not have a reflector in the lens. I made a short video that shows the light with the lens off. It would be a fairly water resistant light. A better option may be # MC35AB. It is about the same size and it has a reflector in the lens. It is not as low profile as the flush mount light you referenced. If you are not opposed to switching to round we have # MCL59AB or # MC57AB which has a reflector in the lens and can be flush mounted using harness # A46PB...
view full answer...

Do you have a question about this Trailer Light?

Info for this part was:

Expert Research:

Mike L

Expert Research:

Patrick B

Expert Research:

Jeff D

Expert Research:

Reno H

Expert Research:

Jameson C

Updated by:

Laura H

Updated by:

Wilson B

Updated by:

Brian T

Installed by:

Cole B

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