Truck-Lite 97701 Rectangular Black Foam Sealing Gasket (Replacement Housing Pad for 25 Series 25766R and 25766Y Marker Clearance Lights)

Protect your vehicle lighting from short circuits and stop moisture tracking with the heavy-duty seal of the Truck-Lite 97701 Rectangular Black Foam Sealing Gasket. Specifically engineered as a high-performance, close-cell cushioning profile for the classic Truck-Lite 25 Series clearance marker lamps, this premium replacement gasket provides an air-tight, water-resistant interface between the lamp base and your vehicle body panels. It serves as an essential maintenance component to optimize the lifespan of your vehicle lighting systems and keep your fleet fully compliant with Department of Transportation (DOT) and FMVSS 108 highway lighting regulations.

Don't let environmental exposure cause premature lamp failure. This gasket is stamped from high-density, ozone-resistant black foam designed to compress cleanly beneath mounting fasteners. Its specialized cellular mapping absorbs intense chassis vibrations, isolates the lens assembly from mechanical shocks, and effortlessly fills minor irregularities along sheet metal vehicle bodies—making it a favorite option for Mack truck cabs, box trailers, and dry van bodies.

Physical deterioration can cause water entry, bulb corrosion, and wire failure. The 97701 serves as a defensive buffer against high-pressure road spray, road salts, coastal humidity, and corrosive chemical winter de-icers. When replacing or servicing your Truck-Lite 25766R (Red) or 25766Y (Yellow) incandescent marker lamps, adding a fresh foam seal ensures your lighting remains weather-sealed.

Designed for quick, accurate drop-in field installation, the gasket mirrors the exact perimeter configuration of the light housing, allowing immediate alignment of mounting screw positions for a stress-free replacement process.