Oyviny 7-Way Blade to 4-Way Flat Trailer Adapter — 5 ft Coiled, PU Jacket & Pure Copper

The Oyviny 7-pin blade to 4-pin coiled trailer extension is a stretchable 5-foot adapter cable that converts a vehicle's 7-way blade socket to a 4-way flat trailer plug with PU insulation and pure copper conductors.

This compact coiled wiring adapter simplifies towing by letting vehicles with a 7-way blade connector supply lighting and basic electrical functions to trailers with a 4-way flat connector. Built with a polyurethane (PU) jacket, brass terminals and pure copper wiring, it resists abrasion and maintains good conductivity while the coil keeps the cord off the ground and reduces tangles during turns or backing maneuvers. The unit ships ready to connect — no cutting or splicing required — and includes a rubber dust cover to keep the 4-pin end protected when not in use.

How does this adapter change a 7-way vehicle plug to a 4-way trailer connection?

The Oyviny adapter reroutes the essential lighting circuits from a 7-way blade socket into the four standard pins used by many small trailers. It maps power for left/right turn signals, tail/stop lights and the ground so the trailer's lamps function correctly without rewiring.

• Converts 7-way blade socket to 4-way flat trailer plug.
• Preserves turn, brake, tail and ground circuits.
• Ready to plug in — no splicing or tools needed.

Will the coiled design and PU jacket hold up in outdoor and towing conditions?

The spiral coil reduces dragging and snagging, keeping excess cord tucked behind the vehicle. The PU jacket offers improved wear and temperature resistance compared with standard PVC, while brass terminals and pure copper conductors deliver reliable conductivity.

• Coiled construction prevents ground contact and reduces tangles.
• PU insulation resists abrasion and temperature extremes.
• Pure copper and brass terminals maintain low-resistance connections.

How easy is installation and daily use for routine towing?

Installation is plug-and-play: insert the 7-way blade into the vehicle socket and plug the 4-way flat into the trailer harness. Two molded handles on the 7-way socket improve grip for connecting or disconnecting, and a rubber dust cap protects the 4-pin end when stored.

• No splicing — connects directly to existing sockets.
• Molded handles for easier plug/unplug operations.
• Dust cover guards the 4-pin connector from moisture and dirt.

What are the length and stretch expectations for the 5-foot coiled cord?

The cord’s designed length is 5 feet (60 inches) when fully stretched, but typical usable extension is about 36 inches in most towing setups. The coil gives compact storage and flexibility, while still allowing sufficient reach for many vehicle-trailer pairings.

• Nominal listed length: 5 ft (60 in) fully extended.
• Practical usable stretch: roughly 36 in in common configurations.
• Compact coil reduces slack and clutter while towing.

Who is this for: The Oyviny 7-pin to 4-pin coiled trailer adapter suits users who tow small trailers, boat trailers, cargo carriers, or utility trailers from vehicles equipped with a 7-way blade socket but need the simpler 4-way flat connection on the trailer. It’s useful for owners who want a durable, low-maintenance, plug-and-play wiring solution that resists wear, keeps the cord tidy, and preserves essential lighting functions without rewiring. Confirm the required stretched length before buying to ensure it fits your towing arrangement.