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Uni-Lite LED Clearance and Side Marker Light w Grommet - Submersible - 2 Diodes - Red Lens

Uni-Lite LED Clearance and Side Marker Light w Grommet - Submersible - 2 Diodes - Red Lens

Item # MCL11RKB
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MCL11RKB - 1 Inch Diameter Optronics Clearance Lights
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3/4" Round. Waterproof mini trailer light with 2 red LEDs functions as both a clearance light and a side marker light when properly mounted. Red polycarbonate lens. Recessed mount with included black PVC grommet. 2-Wire pigtail. PC rated. Lowest Prices for the best trailer lights from Optronics. Uni-Lite LED Clearance and Side Marker Light w Grommet - Submersible - 2 Diodes - Red Lens part number MCL11RKB can be ordered online at etrailer.com or call 800-298-1624 for expert service.
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  • Reviews (553)
  • Q & A (33)
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  • Why etrailer?

Optronics Trailer Lights - MCL11RKB

  • Clearance Lights
  • Round
  • LED Light
  • Red
  • 1 Inch Diameter
  • Recessed Mount
  • Optronics
  • Rear Clearance
  • Side Marker
  • Submersible Lights

3/4" Round. Waterproof mini trailer light with 2 red LEDs functions as both a clearance light and a side marker light when properly mounted. Red polycarbonate lens. Recessed mount with included black PVC grommet. 2-Wire pigtail. PC rated.


  • Small, round trailer light functions as both a clearance light and a side marker light when properly mounted
  • Sealed, waterproof construction is submersible
  • LEDs make great replacements for incandescent lights
    • Last 50 times longer
    • More efficient - provide brighter light with less power output
    • No bulbs to replace - no brittle filaments
  • Polycarbonate lens and housing
  • Red lens with red LEDs
  • Recessed mount with included black PVC grommet
    • Installation requires an 11/16" hole at desired location
  • 2-Wire pigtail - included power lead and ground wire
  • DOT compliant
  • PC rated


  • Light dimensions: 3/4" diameter x 7/8" deep
  • Grommet diameter: 11/16"
  • Diodes: 2
  • Power draw at 12.8 volts: 0.03 amps
  • Lifetime warranty on LEDs

Optronics light dimensions

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 circuit board is sealed, which means that water will not damage the diodes or circuit board.

PC-Rated Lights

Diagram of light spread for PC rated light

A PC-rated light produces a 90-degree angle of light to either side of its centerline for a total of 180 degrees of coverage. This beam pattern can be clearly seen when you are standing directly in front of the light, as well as when you are standing on either side of the light. When properly installed, this type of light can function as both a front clearance light and a side marker light or as a rear clearance light and a side marker light.

MCL11RKB Optronics Uni-Lite Mini LED Side Marker/Clearance Trailer Taillight with Grommet - PC Rated - Red

Alternate part number: MCL-11RKB

California residents: click here

Customer Reviews

Uni-Lite LED Clearance and Side Marker Light w Grommet - Submersible - 2 Diodes - Red Lens - MCL11RKB

Average Customer Rating:  4.9 out of 5 stars   (553 Customer Reviews)

3/4" Round. Waterproof mini trailer light with 2 red LEDs functions as both a clearance light and a side marker light when properly mounted. Red polycarbonate lens. Recessed mount with included black PVC grommet. 2-Wire pigtail. PC rated.


I bought a couple more of these two-diode LED clearance lights to add some more lighting to the rear of my kayak trailer. They work nice and are easy to install in 3/4" holes that I drilled through a piece of aluminum angle. The trailer has orange clearance lights on the front sides, red clearance lights on the back sides, the stop/turn/parking lights on the back, three red clearance lights on the back, and a white LED license plate light. It's really lit up and very visible at night from the rear and sides. Thanks to etrailer.com for great products and services! My wife and I like to kayak, but we don't like to deal with putting our kayaks on roof racks on the top of a car. So I bought a used Load-Rite trailer that was designed to hold one Jet Ski, and added a frame made of slotted angle and 2x6 lumber to hold the kayaks, and a cargo box from Tractor Supply to hold kayak seats, life jackets, towels, sun-protection clothing, and some spare gear (ropes etc), and bought all new LED lighting from etrailer.com. The paddles are too long for the cargo box so they have to go in the car! The kayaks are tied down to the trailer with several ropes front and rear, so there is a lot of safety factor in the design....I don't worry about the kayaks coming off the trailer! The entire rig works great....when we return from a kayak trip we just back the trailer in the barn and it's ready to go for our next trip. I put a 5" diameter wheel on the trailer just behind the hitch so I can push it around on flat level surfaces. See the pictures.

Those lights, and all the lighting and trailer wiring products that I bought from etrailer.com, are working great! I used to have constant problems with the lights on my trailer until I switched everything out to the LED lights from etrailer.com! Now they work every time we use the trailer knock on wood!.
Greg - 10/17/2017


Great addition to the basic, rear brake lights of a camp trailer. I added these LED RED to the brake/turn function, within the existing, small holes in the rear bumper--much more apparent when stopping/turning. These sealed LED lights are very common on larger trucks and trailers now. Easy to install and very robust assembly...priced right!

Always great, tested products from ETrailer. These LED lights did not disappoint...still shining brightly. Thanks!
Jerry N - 06/19/2018


I really like these little corner marker lights. Just drill a hole then pop in the grommet and light.


I ordered these light to be used as accent light on a new lift table for my company. I needed low profile and fairly bright red light to be reflected off our off-white power coat. These little lights out preformed what we were hoping for. The only thing I don't like about them is the instructions say to drill a 11.16" hole. Assembly was WAY too tight at that dimension. So we stepped it up a fraction at a time and found that 17/64" (.73) and 3/4" (.75) were perfect. Even at 3/4" the grommet was snug and water tight. The light had to be squeezed into place but at 11/16" I felt like I was about to brake the light. Overall I am super pleased with the lights. We added them to the Bill of Materials and we will be ordering them for these new carts.


Love these l.e.d. lights. Had seen exact same lights on a new truck at work and wanted them for my personal truck. Found them here on etrailer at a great price. They are really bright for such a small light and low current draw. Simple, fast install.


Worked great for rear turn signals on my RZR


I ordered two small trailer lights from this place, when they came, for whatever reason, they weren't the same light. Kim P. at e-trailer went out of her way as far as I was concerned to make sure I got taken care of and got the right light coming. Outstanding customer service! Would definitely buy from this place again.

excellent product, good place to do business with!
Ronnie - 12/07/2019


I bought 6 of these lights to put on my jet ski trailer. 4 amber and 2 red. And they are very bright. I highly suggest putting these lights onto your fenders. I put an amber and a red one on each fender in their appropriate locations of course. It helps when backing up into small dimly lit spaces at night...like a driveway The red ones reflect off of whatever you are backing towards...and the amber ones give you an idea how close you are to walls or trees in the side mirrors. Just be cautious when you put them in. Make sure that in your mind everything is good to go (like, say, the wiring), and you do not need to pull it back out. If you push it in all the way...good luck getting it out. The grommet mushrooms out at the bottom basically locking it in place. If there was a warning about this on this site and I missed it...my bad. I just made sure I left them all loose until I was done, made sure the wires in the trailer (especially the ground wire) were not getting stretched or pinched, as my trailer is old, and then pressed them all in by hand. I made the mistake of pressing one into my passenger fender...just to see how it looked. This was before I started wiring anything. At this point I was drilling the 3/4" holes...which by the way is very time consuming. I spent a few minutes trying to remove it without damaging the wires. No luck. Not even a little did it want to budge. And I was able to get at it from the top and bottom. Thank goodness this didn't happen with the holes I put into the sides of the trailer because I think I may have had to destroy that light just to get it out and wire it up, which would have sucked because I think that would have pissed me off to the point of not even wanting to use the lights anymore and I would have picked something else out. And that would have been a shame because these lights put out an incredible amount of light. When you put them in the first time, they give off a sort of weird glow. I thought my eyes were playing tricks on me at first. If you manually adjust the lights to the proper DOT code or whatever, they look good. But, if you rotate them so that they are horizontal instead of vertical, they put out a ton of light towards the street. What I'm saying is...if you want to change it up, you can turn them all horizontal in a matter of seconds, and be lighting up the road...literally...just like the neon vehicle underbody kits of the 90's. Admit it. You thought they were cool too. Now, you can sort of have that, except it's legal. I went overkill on my small trailer. At least I thought I did. Now, after using it at night, I am more than satisfied. What a huge difference these tiny lights make. A++++SELLER. WOULD BUY AGAIN. ASSET TO ETRAILER.COM

What a great idea. Follow up with customers to get feedback. That way you can tell if the products are still good or if they have limited lifespans. You get to see if people are still happy and get them thinking about your company again if theyre in the market for more trailer stuff.To answer your question, I do not have them anymore. I sold all of my gear, but do know they are still working. I really liked those small lights. They put out an incredible amount of light and were easy to install once I drilled holes into my old trailer.
Phil M - 08/21/2015


I needed a couple of small lights for a little trailer I am building to pull my grandsons behind my golf cart and these look to be a great product at a great price. Thanks again etrailer


Great LED red marker light. Bright and easy install


Fair prices, excellent delivery time, high quality. Great to do business here.

They are bullet proof! No need to buy elsewhere.
Wayne K - 09/19/2017


Good substitution for larger marker lights on teardrop trailer.


they are great! no troubles whatsoever .I have then on my boat trailer (20) on a 16 footer, even 2 clear ones for back up lights. I beat on them never even unplug them when i put it under the water to launch or land the boat ,,,,,,,, Also on my flat bed still adding ones on it lol.


Bright but the 11/16 hole seemed to small. I used3 3/4 and it still was pretty tight.

Works and it easy to install.
Damien - 08/01/2020


This is a classic American product: tough, effective, and reasonably priced. They are to be replacements on a flatbed I am installing on another truck. So that they fit is definitely a bonus. Yet I'm looking also to increase efficiency with LED bulb equivalents. This is not easy to do because most of these fixtures have bulbs so well shock mounted and with bulbs that last so long replacements are not a priority. eTrailer did a fine job of putting me in touch with people at Peterson who can provide the necessary specifications. Shipping was fast. Packaging was fine. No complaints.


works great and it looks great


MCL11akb: Uni-Lite LED Clearance and Side Marker Light w Grommet - Submersible - 2 Diodes - Amber Lens - MCL11AKB Purchased both the AMBER and RED. Very BRIGHT for such a small light. 2 LED, are better then another brand I purchased that had 1 LED that was supposed to be brighter then the 2, it Wasn't. I like this product, used the amber on the front of the truck, used the RED to highlight some spots on the rear of the trailer. High Quality Rubber Grommet, solid construction, water proof. Which the wires came with connectors. For the money its' a solid purchase.


We ordered these red marker lights for night time use on our heavy equipment, to be seen from a long distance, wow they work perfect we have installed the Amber and the red marker lights on our bull dozer that gets used after dark and we can easily tell what direction the dozer is facing from long distance, these are a great product, MCL11RKB is the red ones and MCL11AKB is the Amber lights, they both are very bright and are easy to install, a great product, we will install these an all our night equipment, thanks retailer for a great product!!!!!


All the products I have purchased from Etrailer have been good. Quailty, durable products, fast shipping and easy transactions. Etrailer.com has pretty much any product you need for your trailers. Thank you Etrailer!


Nice and bright, let me add a light higher on my small utility trailer so it's easier to see behind my truck.

Great! Thought I had a problem with them, turns out it was rodents! I put the lights at the top of the trailer ramp on either side so I can see it better when towing in the dark.
Robert M - 12/09/2018

We offer wire loom in various diameters that would provide at least a layer of protection for your trailer wiring. You can see what we have available by using the link I provided.

-- Etrailer Expert Mike L - 12/10/2018


These lights are great unbelievably Bright I agree with everyone else they are great if I would've known they were as bright as they are I would've ordered another one to put on my tractor for an oil warning like they're very bright even in the daylight

Still working great! i did put one on my tractor for low oil warning light and works great
Larry S - 03/24/2015


These are some bright LEDs! I'm going to use them as rear bumper accent lights on my truck and judging from their quality I would believe they will last for a very long time. They arrived very quickly-so fast that I am now waiting to receive the waterproof connectors that I purchased from another vendor. I would buy these LEDs again!

Youre very welcome for the product reviews I was glad to do them. The lights are excellent little marker lights and are noticeably bright. I custom installed them on the front and rear of my 2015 F150 and many times I have been asked by other folks where I got them. I have always pointed them in your direction so may be youve gotten a few sales!
Splinterman - 01/23/2018


Easy to install. Matches existing clearance lights on my boat trailer. Still working as designed. Excellent product.


Needed small lights for parking lights for my RZR to make it street legal... They fit the lip of the fender nicely and are very bright. Would also work for turn signal lights as they are as bright as the surface mount ones that came in the kit i bought. Would have looked better too. These set back in the grommet much farther than in the picture, they look good.


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