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

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

Item # MC57AB
Our Price: $4.92
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Shipping Weight: 0.06 lbs
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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 or call 1-800-940-8924 for expert service.
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  • Reviews (68)
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Optronics Trailer Lights - MC57AB

  • Clearance Lights
  • Round
  • Incandescent Light
  • Amber
  • 2-1/2 Inch Diameter
  • Recessed Mount
  • Rear Clearance
  • Side Marker
  • Submersible Lights
  • Optronics

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.


  • Round trailer light functions as either a side marker or clearance light when properly mounted
  • Built-in reflex reflector removes the need for a separate reflector
  • Sonically sealed, waterproof housing and lens unit is submersible
  • Incandescent bulb can be easily replaced
  • Durable polycarbonate housing and lens
  • Amber snap-on lens over incandescent bulb
  • Compatible with 12V DC electrical systems
  • Recessed mount with grommet (A55GB or A56GB - both sold separately)
  • Accepts industry standard 2-prong plug (A46PB or A86PB - sold separately)
  • DOT compliant
  • P2 rated


  • Dimensions: 2-1/2" diameter x 11/16" thick
  • Bulb type: incandescent
  • Power draw at 12.8V: 0.2 amps
  • 3-Year warranty

Manufacturer Cross Reference
Light will work as an exact replacement for:
Uni Bond # SR2500A
Wesbar # 223223
Truck Lite # 10205Y
Grote # 45813
Peterson # 143A

Optronics MC57 Series Marker Clearance Light Dimensions

Sonically Sealed, Waterproof Trailer Light

The waterproof construction of this light makes it ideal for use on trailers that may be submerged, like a boat trailer. The housing and lens are sonically sealed together to create a single unit, which means that water will not get into the light and damage the diodes or circuit board.

P2-Rated Lights

Diagram of light spread for P2 rated light

A P2-rated light produces a 45-degree angle of light to either side of its centerline for a total of 90 degrees of coverage. This beam pattern can be seen straight on, but it cannot be seen clearly from the side. So this type of light can be used as either a side marker light or a clearance light, but it cannot function as both. If you need both functions, then you must install 2 separate lights on your trailer - one as a front or rear clearance light and one as a side marker light.

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

Alternate part number: MC-57AB

California residents: click here

Customer Satisfaction Score:

Customer Reviews

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

Average Customer Rating:  4.8 out of 5 stars   (68 Customer Reviews)

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.


You sent me the wrong light. I ordered a incandescent light and I was sent a LED fixture. This light has wire’s coming out the back and the one I ordered was a plug-in style. Please send the light I ordered.

Of course you would want to have the correct light. I will have our customer service team reach out to you.
-- Etrailer Expert Jenny N - 11/08/2022


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.


E trailer did a fantastic job.
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.


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

Still working fine!!
Dj - 05/14/2021
Still working fine!!
Dj - 05/14/2021


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.


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


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.


Good selection of product


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


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.


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.


Wrong ones

Thank you for bringing this to our attention. Our customer service team will be reaching out in the near future.
-- Etrailer Expert Brooke M - 09/14/2021


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


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.


Right part at the right price. And fast delivery!


Very good quality,,just like the OEM marker light that came on my trailer.


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


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


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

I am still impressed with your units
Andy S - 08/14/2015


Still kicking!


nice light, good price


Good lights. I use them all the time!


Fast service, good product and very good communication.


Perfect replacement for a broken Marker Light, fits and works great.


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

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
    Image 1 for
  • 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...
  • 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...
  • 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...
    Image 1 for
  • 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...
  • 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...

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