Description
The 91740 Rubber Grommet for 4″ Round Lights is a heavy-duty black rubber mounting grommet designed to fit all standard 4″ round trailer lights. Also commonly referenced as M50400-B, this grommet creates a secure, shock-absorbing, and weather-resistant seal between the light and the trailer body, protecting the wiring and bulb from moisture, dust, and road vibration.
Made from flexible, high-quality rubber that resists cracking, UV damage, and extreme temperatures common in South Texas, the 91740 grommet ensures your lights stay firmly in place even on rough roads and during heavy daily use. It is compatible with most popular 4″ round lights from Grote, Peterson, Truck-Lite, and other major brands.
Proper grommet installation prevents water intrusion that can cause short circuits or premature bulb failure, saving you time and money on repeated light replacements.
Key Features & Benefits:
- Fits all standard 4″ round trailer lights (clearance, marker, stop/tail/turn, etc.).
- Heavy-duty black rubber construction for durability and flexibility.
- Provides watertight, vibration-resistant mounting.
- Protects wiring and light housing from moisture and dust.
- Resists UV rays, heat, cold, and road chemicals.
- Easy to install — simply push the light into the grommet and mount into a 4-1/2″ hole.
- Also known as M50400-B in some catalogs.
Whether you’re replacing damaged grommets on existing trailers or wiring up new lights on utility trailers, flatbeds, or ranch equipment around San Antonio, this 91740 rubber grommet is an essential, low-cost part for reliable trailer lighting.
At Ace Welding & Trailer Co., your trusted family-owned trailer repair and parts business in San Antonio, we stock a full range of trailer light grommets including the 91740 4″ round rubber grommet, along with Grote and Peterson lights, reflectors, wiring kits, trailer brakes, axles, solenoids, liftgate parts, and more. Local fleets, towing companies, construction businesses, and ranch owners count on us for quality San Antonio trailer parts and fast, professional service. Order your 91740 Rubber Grommet for 4″ Round Lights online at aceweldingandtrailer.com or stop by our San Antonio shop for immediate pickup and expert advice. Keep your trailer lights secure and working perfectly with dependable parts from a local Texas business you can count on!
91740 OR M50400-B or LIGHT RUBBER GROMMET RD 4
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