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Complete All-In-One Installation Kit: Comes supplied with the 4" round clear light head, a flexible black flush-mount grommet, and a 2-wire right-angle PL-2 wiring harness for an instant drop-in replacement.
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Vibration-Welded / Sonically Sealed Body: The premium polycarbonate lens and housing are permanently fused together to protect internal components from moisture, fine cargo dust, and debris.
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Shock-Mounted Heavy-Duty Bulb: Specialized elastomeric internal bulb cradle dampens chassis vibrations and severe road jolts, ensuring the filament outlasts standard interior lights.
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Streamlined Low-Profile Fit: Mounts seamlessly into any standard 4.5-inch diameter structural cutout panel utilizing the included heavy-gauge black PVC grommet for a sleek, tool-free flush mount.
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Flexible Wiring Options: The included 16-gauge pigtail harness features a right-angle PL-2 plug on one side and a stripped-end / ring terminal layout on the other for easy vehicle electrical integration.
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Future-Proof Upgrade Strategy: Perfectly matches standard 4-inch industrial spacing, allowing an effortless plug-and-play upgrade to LED systems down the line using Truck-Lite’s Super 44 Series.
Truck-Lite 40003 – 40 Series 4" Round Clear Sealed Incandescent Dome Light Kit (Black Grommet Mount, PL-2 Right Angle Plug)
Brighten your commercial vehicle's interior cabin, cargo bay, or utility compartment with the heavy-duty Truck-Lite 40003 40 Series Dome Light Kit. Engineered for elite structural durability and crisp, dependable interior illumination, this 4-inch round clear sealed light kit is an industry-standard choice for heavy-duty commercial semi-trucks, step vans, medium-duty delivery trucks, motorhomes, and utility service bodies.
This complete, ready-to-install kit consists of three perfectly matched factory components: the Truck-Lite 40203 Clear Sealed Lamp, a 40700 Black PVC Mounting Grommet, and a 94992 Right Angle PL-2 Pigtail Plug. Built to handle the severe, non-stop shaking of commercial hauling, the polycarbonate lens and housing are vibration-welded (sonically sealed) into a single piece to prevent moisture or dust infiltration. Inside, the high-output single incandescent bulb is isolated by a heavy-duty shock mount that absorbs rough road impacts, dramatically extending bulb life and preventing premature failures.