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Trailer Clearance or Side Marker Light - Submersible - Round - Red Lens - Black Flange
(2623 reviews)
Price: $3.34
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Trailer Clearance or Side Marker Light - Submersible - Round - Red Lens - Black Flange
Part Number: MC56RB
In Stock
$3.34
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- All Info
- Reviews (2623)
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- Videos (1)
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Optronics Trailer Lights - MC56RB
Highlights
- Reliable In Any Weather: Sonically sealed, waterproof housing keeps water out, even when submerged.
- Simple Power Connection: Accepts industry-standard 2-prong PL-10 plug for quick wiring.
- Compact, Versatile Fit: 2-1/2" light fits 2-3/4" recess with 2-11/16" mounting hole spacing.
- Clear, Compliant Visibility: P2-rated red lens meets DOT standards for safe clearance or side marking.
- Built to Last: Polycarbonate lens and housing resist impact and wear.
- Low Power Draw: Uses only 0.2 amps at 12.8 volts for efficient lighting on any trailer setup.
Features to know about
Built for Wet Conditions: Sonically Sealed and Submersible
This round trailer light is fully sealed to handle wet or submerged use. The red polycarbonate lens and housing are sonically sealed into one waterproof unit, keeping moisture out and protecting the internal bulb from corrosion or electrical damage. It’s built for environments where water exposure is common, so you can count on it to keep shining bright no matter the conditions.
Simple, Flush Fit: Recessed Mount with Built-In Black Flange
Clean installs are easy with the recessed mounting design and built-in black flange. It fits into a 2-3/4" diameter hole and uses standard mounting holes spaced 2-11/16" apart. The low-profile shape sits neatly against the surface for a finished look that won’t snag or catch. Hardware isn’t included, so you can choose the fasteners that fit your setup best.
Reliable Power Connection: Standard 2-Prong Plug Compatibility
No special wiring needed here—the light accepts an industry-standard 2-prong PL-10 plug (sold separately). That makes it simple to connect to existing trailer wiring without splicing or adapting. It draws only 0.2 amps at 12.8 volts, so it won’t strain your system while still delivering bright illumination where you need it.
Bright and Compliant: Red P2-Rated Illumination
This light meets DOT standards and carries a P2 rating, producing a focused beam pattern visible straight on for use as a clearance or side marker light. The clear, even output from its incandescent bulb ensures your trailer stays visible in low-light conditions while meeting safety requirements.
Durable Build for Long Service Life: Polycarbonate Lens and Housing
Both the lens and housing are made from tough polycarbonate that resists impacts and UV fading. Combined with Optronics’ sealed design and a 3-year warranty, this light delivers dependable performance trip after trip without worry about cracks, leaks, or dulling over time.
Specs
Dimensions
- Light diameter: 2-1/2"
- Overall dimensions: 3-7/16" diameter x 15/16" deep
- Distance between mounting holes: 2-11/16"
Electrical
- Power draw at 12.8 volts: 0.2 amps
Warranty
- Warranty: 3-Year warranty
MC56RB Optronics 2" Round Side Marker/Clearance Trailer Taillight - P2 Rated - Red Lens - Black Flange
Video of Trailer Clearance or Side Marker Light - Submersible - Round - Red Lens - Black Flange
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Video Transcript for Comprehensive Review: Trailer Clearance or Side Marker Light
Today we're going to be taking a look at part number MC56RV. This is the Optronics trailer clearance or side marker light. This is a sonically sealed waterproof design when it comes to the housing and the lens. The unit is submersible. It's going to feature the red lens. We're going to have the really durable polycarbonate lens and housing, very strong and durable.
The unit's going to contain one incandescent bulb. This is designed to be a recess mount installation with built-in black flange here kind of the base of the light. Your hardware's not included but you can see that it's going to contain 3 mounting holes. We can take a measurement of the recessed portion. That's going to tell us what size hole this unit would mount into. That looks to be 2-3/4 of an inch so the light will fit into a 2-3/4 inch diameter hole.
Here on the back side you're going to see the connection point to provide power and ground to the light. This will accept your industry standard 2-prong plug. That is available here at etrailer.com. It is sold separately. The light itself is Department of Transportation compliant. It's a P2 rated light.
If we take a measurement of just the diameter of the lens portion, we're looking at about 2-1/2 inches. Overall diameter, measuring from edge to edge, we're looking at about 3-7/16 of an inch. It's going to give us a measurement from front to back of about 15/16 of an inch in depth. The distance that we'll have between the mounting holes measuring center on center, that's going to be separated by 2-11/16 of an inch. The power draw on the unit at 12.8 volts is 0.2 amps. I'm going to take a measurement from the bottom of the flange to the bottom of the recessed portion.
That's going to give us a measurement that looks to be 9/16 of an inch, so just over 1/2 inch. We're going to go and hook it up to our actual power source. That way you can see what it looks like with power running to it. I have a 2-prong plug already connected so you can see how it connects. It goes right into the connection points here on the back, pushes in for a nice tight seal and a good fit. You can see the light sends out a really nice consistent signal. Again, this is going to work as your trailer clearance or side marker light. The red circular lens allows a lot of light to come through, distributes it pretty evenly and again, the lens in the housing is going to be made from that strong polycarbonate material so it's going to stand up well to the elements and over time. That's going to do it for today's look at part number MC56RV.
Customer Satisfaction Score:
99% were satisfied with this product
1% of customers were not satisfied
Ratings & Reviews
4.9
2623 reviews
by:
WeldSmith
01/23/2023
They work well in place of lights with rubber grommets that won’t stay installed because the holes are worn or too big. I’ve had these on a trailer for a year and they have operated great with no problems.
by:
Sean S.
08/30/2015
2004
Chevrolet
Silverado
I could only find my trailer light at etrailer. They don't make my type of trailer anymore so parts are hard to find. Etrailer.com had the exact replacement piece and fit like a glove. Outstanding customer service and updates on orders. Thanks
by:
Matt
10/16/2019
Lights are great and the order was shipped fast.
by:
Matt
10/16/2019
Lights are great and the order was shipped fast.
by:
Dustin
07/07/2019
Worked as designed, easy to install.
by:
Ho
01/20/2022
by:
Dustin M
10/10/2022
by:
Jim
10/24/2021
by:
Rick
09/02/2022
by:
John
10/13/2026
These style of bulbs came off an older enclosed trailer my girlfriend owns for her floor cleaning business. Most of them didn't work and all of them had faded so that they were mostly clear and faded. Not only did I get new bulbs but I wasn't forced into upgrading the entire trailer to led bulbs.
by:
WTH
04/29/2026
2014
Ford
F-150
High quality, inexpensive marker light. Easy to install, it happened to be in my mailbox as I was departing with the trailer so I just popped it in. Matches the OEM lights on the trailer.
by:
John in Vancouver
07/05/2021
I bought 5 of these amber lights for the front of my trailer, and 5 red counterparts for the back, and similar oval side lights too, to replace all of the 50-year-old corroded lights on my 1970 Shasta M1400. I am super pleased with them, as they look period-appropriate, and are very bright as well. The only issue I had was that the Shastas of that period used the aluminum skin of the trailer as the ground, so there is no "ground wire." On a couple of them, the caulking I put under the lights made the ground screw not find the metal skin to ground the circuit. So just a note to be careful when you put the caulk on the back of the light when you are installing. Make sure you don't caulk over, and thus insulate, the ground plate. Btw, this was my first purchase from etrailer.. and in the past year, I have purchased probably another $xxxx of stuff for our trailer. Great selection, great service. This website really should be your first stop when modernizing your "vintage" trailer.
John V.
7/6/2022
A year after purchasing these, I continue to be very pleased with these lights. I actually replaced all 20 of the marker lights and the big tail lights with these LED lights from e-trailer. I have had only one marker light lose its ground connection, which I remedied by replacing the sheet metal mounting screw with a slightly large screw. As noted above, this is not a problem with the LED lights, but rather, with the vintage trailers system of grounding through the sheet metal skin of the trailer, rather than providing a positive and negative wire lead to each light. People often stop us at camp grounds to ask questions about our old shasta, and one person even marveled that the lights were still working after 50 years. A good testament to how natural they look.
by:
Susan
10/25/2026
Although they did come a day later than expected they were exactly what he was looking for. Ordering was very easy on line and packaging was well done. We would order from them again.
by:
John
10/08/2026
The exact product I was looking for. Most of the existing drywall bulbs had lost their color even though some of the bulbs still worked.
by:
Harvey C
05/18/2018
As per your request here is a photo of the installation of the running lights that I purchased from etrailer. I have included a photo of the original light fixtures that I replaced. The originals were proprietary to Winnebago Industries, but have not been available for some time. The top piece that the lights mount on are made of a plastic material & was molded to accept the fixtures into a small recessed area. As a consequence, I could find no replacements at the local suppliers. I found the MC68RB fixtures on your web site & felt sure that they would fit the recessed area. They did fit, & I was able to install them with some common sense adjustments to the new fixture & the area that received the fixture:
1 added another wire to provide ground for the light.
2 drilled a hole to accommodate the wires in the center of area to receive the fixture, as the original hole was set to one side.
3 mounting holes were wider than new fixture - used one of the original holes & used a self drilling screw on the other.
We are happy with the installation, and in our opinion there is very little difference in appearance of the area between original & replacement provided by your company. There are at least 2 models (View & Nation) that used the original, global-bright 122R/122Y, sold between 2005 & 20013 from what I can tell.
I no longer have the good camera that took the photo of the original photo. The photo of the replacement fixtures was taken by a smart phone, hence, less quality of photo. Sorry the quality is so poor.
1 added another wire to provide ground for the light.
2 drilled a hole to accommodate the wires in the center of area to receive the fixture, as the original hole was set to one side.
3 mounting holes were wider than new fixture - used one of the original holes & used a self drilling screw on the other.
We are happy with the installation, and in our opinion there is very little difference in appearance of the area between original & replacement provided by your company. There are at least 2 models (View & Nation) that used the original, global-bright 122R/122Y, sold between 2005 & 20013 from what I can tell.
I no longer have the good camera that took the photo of the original photo. The photo of the replacement fixtures was taken by a smart phone, hence, less quality of photo. Sorry the quality is so poor.
by:
Scott
08/03/2018
In the process of detailing my 2003 motorcycle trailer to get it looking good again. Clearance lights needed replacement. The original red lights were now faded pink for goodness sake! Replaced all 20 lights with the thin-line red and amber side marker lights. Replacement couldn't be more simple; remove original lights, snap in new. Exact fit and everything worked perfectly. Now, once the new tires and wheels get here we'll be in good shape! The new lights definitely make you say, "no way that trailer's 15 years old" :-)
by:
Dean
04/30/2018
2018
Chrysler
Pacifica
Light was an identical replacement. No issues, great service and fast service. Will buy again from etrailer if I have to again.
Dean
4/30/2019
Theyve been working great. Hardest part was finding out the proper part number from the trailer manufacturer to order the right one. The products are still working great.
by:
Charles T.
04/10/2012
to see at night the following lights were added to my custom built trailer for night time safety.
1- Side mount red and yellow fender light which only works when either the brakes or turn signal are in use.
2- Front Clearance lights, which give additional lighting at night when approaching on coming vehicles.
1- Side mount red and yellow fender light which only works when either the brakes or turn signal are in use.
2- Front Clearance lights, which give additional lighting at night when approaching on coming vehicles.
by:
John G
01/25/2019
2012
Toyota
Highlander
Light work great!!!
I always buy from etrailer Customer service and fast delivery
I always buy from etrailer Customer service and fast delivery
John G.
1/26/2020
Still working after a year later going in and out of saltwater [Two Thumbs Up]
by:
Perry E.
03/28/2017
These running lights work great. I use them on my boat trailer which is exposed to a lot of salt water. No problems, for they are a sealed light. For the price I bought extras but haven't had to use them. It's been about a year now.
by:
Michael
10/27/2026
As ordered. On time.
by:
Henry
07/27/2019
Just what I need for my motorhome. Arrived much sooner than I expected. Installation was a snap.
Henry Z.
7/28/2020
Great.
by:
Mark
08/05/2015
I purchased this light assembly and a rubber grommet to replace the right marker light on my Karavan trailer. It fit perfectly and had the proper 2 pin connector. Ordering was easy and it arrived promptly.
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.
by:
John
09/21/2026
Took 11 days to arrive.
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Show More Reviews
See what our Experts say about this Optronics Trailer Lights
- Recommended Round Trailer Marker Lights to Fit in 2-3/4 Mounting HoleThe # MC56RB you were looking at is designed to fit in a 2-3/4" diameter hole and will have mounting holes 2-11/16" apart, so these will work for your 2011 PJ Dumper trailer. If you also need new pigtails for the wiring, you can use the # A86PB or the # A46PB (right angle pigtail). I've linked some review videos of these parts for you to have a look at.
view full answer... - Amber Side Marker Light Recommendation Same Size as MC56RBThe part # MC56RB is a 2-1/2 inch light. For a similar dimension amber clearance light we have the part # MC58AB but this is a surface mount light.
view full answer... - 2-1/2 Inch Diameter Red Round Trailer Clearance Light with Reflective HousingI do have a similar clearance light for you with a reflective housing but the Trailer Clearance or Side Marker Light part # MC56RB does not. Instead, you will want to take a look at the Trailer Clearance or Side Marker Light part # MCL59RB for LED or part # MC57RB incandescent. Unfortunately, these lights are only available with a recessed mount part # A55GB. You are also going to need to use the pigtail part # A46PB.
view full answer...
Do you have a question about this Trailer Light?
Info for this part was:
Expert Research:
Jameson C
Installed by:
Cole B
Updated by:
Amy B
Updated by:
Brian T
Updated by:
Carrie F
Written by:
Wilson B
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Gwendolyn Y.
5/4/2026
Sounds like perfect timing to me!