Seamaka 7-Way to Dual 7-Blade & 4-Flat Trailer Adapter — Dual-Output with Mounting Bracket

Seamaka's 7-way to dual 7-blade and 4-flat trailer adapter converts a truck's factory 7-way socket into both a 7-blade and a 4-flat connector for towing multiple trailer types.

This compact adapter gives you two connector styles from one truck socket so you can hook up different trailers without rewiring or carrying separate adapters. Built with heavy-duty plastic, pure copper wiring, and a spring-loaded dust cover, it’s designed to withstand road vibration and moisture while keeping electrical contacts reliable. The kit includes the adapter, a mounting bracket, fasteners and instructions for straightforward installation.

How does this adapter let me tow different trailers from one socket?

The Seamaka adapter splits a factory 7-way truck outlet into a 7-blade and a 4-flat output at the same time. That means you can plug in trailers that require full 7-pin functions (brake controller, reverse, auxiliary power) or simpler 4-pin lighting-only trailers without swapping connectors.

• Dual outputs: simultaneous 7-blade and 4-flat sockets.
• Direct fit for vehicles with a standard 7-way receptacle.
• Compatible with brake controllers and lighting circuits.
• No vehicle wiring modifications required.

What materials and protection does the adapter offer?

The housing is molded from durable plastic to resist impact and the internal conductors are pure copper for consistent conductivity. A spring-loaded cover seals the plug faces when not in use to reduce dust, corrosion and moisture intrusion, helping preserve contact integrity over time.

• Heavy plastic shell resists road wear and vibration.
• Pure copper wires for stable electrical transfer.
• Spring-loaded dust cover protects contacts when idle.
• Corrosion-resistant terminals for longer life.

How easy is it to mount and use this adapter on my truck or RV?

Installation is straightforward: insert the adapter into your factory 7-way socket and secure the included mounting bracket with the supplied screws and nuts to keep it from dangling. The package includes simple instructions, and connections follow standard pin assignments so most users can install it without specialty tools.

• Includes mounting bracket, screws and nuts for secure attachment.
• Plug-and-play design fits standard 7-way receptacles.
• Instructions included for quick setup.
• Compact form factor reduces snagging behind the hitch.

What trailer functions will work when using this adapter?

The adapter passes through lighting circuits for tail, brake, and turn signals, and supports reverse lights and auxiliary power where the towing vehicle provides them. When connected to a 7-pin trailer, you retain access to brake controller output and additional power circuits that 4-pin connectors do not carry.

• Tail, brake and turn signal wiring supported on both outputs.
• Reverse light and auxiliary circuits relayed via 7-pin output.
• Brake controller signal preserved on 7-pin connection.
• 4-flat output available for lighting-only trailers.

Who is this for: The Seamaka 7-way to 7-blade and 4-flat adapter is ideal for truck and RV owners who tow multiple trailer types and want a durable, ready-to-mount solution to avoid swapping connectors. It suits drivers of Ford, GM, Jeep, GMC and other vehicles with a standard factory 7-way socket who need reliable lighting, brake and auxiliary connections without modifying their vehicle’s wiring.