bing tracking image
  1. Trailer Lights
  2. Optronics
  3. Tail Lights
  4. Round
  5. LED Light
  6. Red
Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 10 Diodes - Round - Red Lens

Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 10 Diodes - Round - Red Lens

Item # STL42RB
Our Price: $12.94
You Save: 55%
Trailer Lights
Orders above $50 qualify for Free Shipping
Shipping Weight: 0.34 lbs
In Stock
Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 10 Diodes - Round - Red Lens Recessed Mount STL42RB
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
5-1/2" Diameter round. Waterproof trailer light serves 3 functions: stop, turn, and tail. Durable polycarbonate lens and housing. Mounts on trailer with built-in flange. Accepts standard 3-prong plug. Lowest Prices for the best trailer lights from Optronics. Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 10 Diodes - Round - Red Lens part number STL42RB can be ordered online at or call 1-800-496-5010 for expert service.
  • All Info
  • Reviews (255)
  • Q & A (0)
  • Photos
  • Why etrailer?

Optronics Trailer Lights - STL42RB

  • Tail Lights
  • Round
  • LED Light
  • Red
  • 4 Inch Diameter
  • Recessed Mount
  • Stop/Turn/Tail
  • Submersible Lights
  • Optronics

5-1/2" Diameter round. Waterproof trailer light serves 3 functions: stop, turn, and tail. Durable polycarbonate lens and housing. Mounts on trailer with built-in flange. Accepts standard 3-prong plug.


  • Red round trailer light serves 3 functions on trailers
    • Stop light
    • Tail light
    • Turn signal light
  • Sonically sealed, waterproof housing and lens unit 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
  • Durable polycarbonate lens and housing
  • Red lens over white LEDs
  • Mounts on trailer with built-in flange - hardware not included
    • Requires a 4-1/2" round hole for installation
  • Accepts industry standard 3-prong plug (A45PB and A47PB - both sold separately)
  • DOT compliant


  • Dimensions: 5-1/2" diameter x 1-15/16" thick
  • Distance between mounting holes (center on center): 4-1/4"
  • Diodes: 10
  • Power draw at 12.8V:
    • Stop/turn: 0.413 amps
    • Tail: 0.0.26 amps
  • LIfetime warranty on LEDs

Manufacturer Cross Reference
Light will work as an exact replacement for:
  • Truck Lite # 44326R
  • Grote # 53292
  • Peterson # M418R-2

Optronics STL42 Series 4 Inch Round LED Light with Mounting Flange Diagram

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.

STL42RB Optronics LED Trailer Tail Light - Stop, Turn, Tail - Waterproof - 10 Diodes - Round - Red Lens

Alternate part number: STL-42RB

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 10 Diodes - Round - Red Lens - STL42RB

Average Customer Rating:  4.8 out of 5 stars   (255 Customer Reviews)

5-1/2" Diameter round. Waterproof trailer light serves 3 functions: stop, turn, and tail. Durable polycarbonate lens and housing. Mounts on trailer with built-in flange. Accepts standard 3-prong plug.


These are exact replacements for my 2009 RangerTrail trailer. Fit perfectly.


They look great and are plenty bright. Don't forget to get those wiring pigtails though. These do not have any way to connect without them. No external wires, just a 3-prong connection on the housing.

These have been a good replacement for the old incandescent lights. Still working great.
Bryan - 11/03/2021


Just as advertised! Work perfect and look great! Fast shipping as well!


great product, was exactly what we needed for our trailer


Matches the original style our horse trailer had


Did not come with wire pigtail. Either was left out of order or you have to order the wire pigtail separately! Lights should have wire pigtail included.


I put these LED lights on my 1967 Scotty. They have a nice clean look, and show up so much better than the originals. The wiring process, with the plug in connections, was easy!


Used these to replace old lights on my horse trailer. Installation was easy and they are very bright. I had issues with a connector on my first order, but the second was just fine. I also had issues with one being dim, but found out it was my trailer plug. Once it was replaced, it was great! Would use these on another trailer if needed.


Part fit perfectly and works great!!
to order and received part sooner than expected!
Recommend etrailer to anyone.


Perfect fit & function. Working flawlessly 1 year later.


Easy to install, works great, so much better than conventional lights.


Great lights, very bright and visible day and night, much much better than the factory bulb light. I have recommended them to our friends who have RV's
Thanks etrailer


Thanks... the light is perfect and at a great price. The other place wanted $26.00 for the same light and you charged much less. I highly recommend for parts.


quality product


Arrived promptly and was packaged in a protective box with padding to protect it during shipment. This was the first time I ordered from the company. I found the stop lights to be a quality product and would order from etrailer again!


100 times better than the original lights I had with traditional bulbs. With the LEDs you can see them even better during the day. Which is nice to know that people can see me at all hours of the day.


Perfect fit, wiring as described! Perfect upgrade for our 60s Sears Tent Trailer


Hope it lasts as long as the original (it lasted 15 yrs)


Easy to navigate website. Found an exact match lights and connection. Fast delivery, competitive pricing and incredible customer service. I highly recommend e trailer for all your needs.

Works perfectly, no dim or burnt out leds. Def. watertight
Paul - 08/06/2021


I am replacing the tail lights on my Ranger trailer. The STL42RB is the submersible version. Our local Bass Pro Shop didn't carry the light, neither did the local trailer repair shop (which was a surprise). I found the right replacement online at e-trailer. The lights were delivered in the time frame promised.
Everything is great.


Perfect application for my home built off road trailer. After many days of rough trail conditions they still work perfectly.


I have used etrailer several times for various needs. I am restoring an older steel horse trailer and I wanted to replace all the lights.

I did purchase what I needed from etrailer; however, the tail lights came without the wiring harnesses, the amber/ red side lights have no way to mount them. I wish that this would nave been indicated on the notes. Now I need to look into how to get the harnesses and mounts from etrailer.

We mention in the product description that the plugwiring pigtail is sold separately.
-- Etrailer Expert Mike L - 02/20/2019


These LED tail lights are exactly what I have been looking for to renovate a trailer with recessed lights. I was excited to find them available from the etrailer company. Placing the order was easy, the company notified me when the order shipped, and the lights were delivered in a VERY TIMELY fashion!! This company has earned a 5 star rating, as well!

Lights continue to function well and they still look great!! Fantastic quality!
John G - 04/30/2018


These lights worked out great. good price too!
EZ install.

Still working great!!
David - 07/10/2020


After my wife has been nagging me for the last few years to fix her custom 5th wheel horse trailer I finally decided to take the plunge. Replaced the old light with these great new LED lights. Super bright and look great. LED lights are very sensitive to ground. This trailer has living quarters as well and the manufacturer made it of tube aluminum then used a torch to cut holes to run the wires in the tubes. The jagged edges over time have caused numerous shorts which all had to be tracked down and wire repaired as needed. When you have a large system that may have a short you can tell when you plug the trailer into the vehicle and the engine drops rpms. This trailer has fuses that once they reach a certain temp they turn off and then will come back on after they cool off. I'm very familiar with my trailer today

Show More Reviews

See what our Experts say about this Optronics Trailer Lights

< Previous

Do you have a question about this Trailer Light?

  • Why

    At we guarantee:
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate trailer light information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Robert G
Expert Research:
Robert G
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee John H
Expert Research:
John H
Employee Adam R
Expert Research:
Adam R
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Kathleen M
Video by:
Kathleen M
Employee Jacob H
Video by:
Jacob H
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Brian T
Updated by:
Brian T
Employee Hannah L
Updated by:
Hannah L
Employee Cole B
Installed by:
Cole B
Employee Andrew S
Installed by:
Andrew S
Employee Shane H
Installed by:
Shane H
Employee Chris R
Video Edited:
Chris R

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.