Partswcgg 4" Round Dual-Function Trailer Lights — 4" Red/White Combo, 19-LED IP67 Waterproof

Partswcgg 4" 19-LED dual-function round trailer lights combine red stop/turn/tail output with a white reverse lamp in one submersible, flush-mount housing.

These compact 4-inch combo lights are built for trailers and trucks that need a low-profile solution delivering both brake/turn/tail signaling and a bright white backup function. Each lamp uses 19 LEDs visible in two colors, ships with a rubber grommet for flush mounting and a standard three-prong pigtail plus an auxiliary plug for reverse power. The assembly is sonically sealed and rated IP67, so it resists rain, road spray and temporary submersion.

How do these lights handle both red signaling and white reverse in a single unit?

Each fixture shares a single LED array that can emit two colors: red for stop/turn/tail and white for reverse when the auxiliary wire is energized. The white reverse circuit takes precedence when activated so the reverse beam appears clearly without additional external lights.

• 19 LEDs per lamp configured for dual-color output
• Dedicated blue auxiliary wire and bullet plug powers white reverse
• White ground, red for brake/turn, black for running lights wiring convention

What are the installation requirements and physical dimensions?

The lights are designed for flush mounting using the included rubber grommet; they measure approximately 5.1" overall diameter and 1.1" height, and require a roughly 4.5" hole for installation. Standard three-prong pigtails simplify connection to most trailer harnesses, while the auxiliary male bullet plug lets you hook up a reverse circuit easily.

• Overall diameter ~5.1"; install hole ~4.5"
• Flush-mount rubber grommet included for snug fit
• Standard three-prong wire pigtail plus extra blue reverse plug

Are these lights durable and suitable for marine or heavy-duty use?

Yes — the housings are sonically sealed and rated IP67, meaning they withstand heavy road spray and temporary submersion. Their rugged construction makes them appropriate for trailers, trucks, boats and other utility vehicles that face wet or dusty environments.

• IP67 waterproof rating for weather resistance
• Sonic sealing prevents moisture and dust ingress
• Works on 8–16 V DC electrical systems common to trailers and trucks

What vehicles and applications are these lights compatible with?

These 4" dual-function LEDs are made to fit a wide range of 8–16 V vehicles and trailers where compact combined signaling and backup illumination is desired. They work well on semi trailers, box trucks, horse and utility trailers, pick-ups, UTVs and more.

• Compatible with trailers, service trucks, buses, and pickup trucks
• Suitable for utility trailers, boat trailers, parade floats and UTVs
• Four-piece set covers common mounting points and replacements

Who is this for: These Partswcgg dual 4" LED combo lights are for vehicle owners, fleet managers and DIY mechanics who need compact, reliable tail, turn and backup illumination in one sealed unit. Choose these if you want easy wiring with a three-prong pigtail plus a separate reverse plug, rugged IP67 protection for wet conditions, and a low-profile flush mount that fits a 4.5" hole. If you’re replacing worn incandescent lenses or upgrading to LED for better visibility and lower power draw, this four-pack provides a convenient complete set for multiple mounting points.