7-Way trailer wiring adapter for commercial vehicles, 4-flat to round plug with bracket 1、STABLE CONNECTION: The adapter establishes a tight connection between the vehicle socket and the trailer plug with no wiggle room or looseness, transferring power from the vehicle to the trailer. 2、MULTI FUNCTIONAL: This 4 pin flat socket can be converted to a 7 pin blade round socket. Suitable for use with most car wiring components, such as turn signals, brakes, reverse lights, and auxiliary power. 3、WATERPROOF AND DUSTPROOF: Featuring a waterproof and dustproof design, this trailer adapter kit provides the necessary protection for your electrical connections, ensuring optimal performance even in challenging environments. 4、RELIABLE CONSTRUCTION: Constructed with high strength copper and ABS materials, this trailer connector kit ensures durability and reliability, making it suitable for long term use in various weather conditions. 5、EASY INSTALLATION: With its 18AWG wire gauge and user friendly design, this trailer connector kit allows for easy installation and convenient connectivity between your trailer and vehicle.