CURT Custom Wiring provides everything you need to connect your vehicle's electrical system to a trailer. With a plug-and-play connector, a custom wiring connector easily integrates with your vehicle to provide a standard trailer wiring connector, typically in the form of a 4-way flat. This custom wiring connector features a vehicle-specific design to perfectly fit certain years of the Ford F250 Super Duty, F350 Super Duty, F450 Super Duty, and F550 Super Duty. It uses an OEM-compatible connector to plug into the vehicle's OEM socket and provides a standard 7-way RV blade output to power the taillights, brake lights, turn signals, trailer brakes, auxiliary, and other electrical functions on your trailer. It comes with a spring-loaded dust cover. This cover keeps the connection points clean and well protected when the connector is not in use.• Plugs into existing OEM vehicle socket to provide a 7-way RV blade socket• Simple plug-and-play design eliminates the need for cutting or splicing• 7-way connects tail, brake, reverse, turn signals, brakes, and auxiliary power• Spring-loaded dust cover keeps connector clean when not in use• Slit loom keeps wires contained and well protected• Factory OEM tow package required for installation• 4-wire to 7-wire upgrade kitCompatible Vehicles1999-2001 Ford F-250 Super Duty1999-2001 Ford F-350 Super Duty1999-2001 Ford F-450 Super Duty1999-2001 Ford F-550 Super Duty Provides a standard 7-way RV blade output to power electrical functions on trailer Spring-loaded dust cover keeps connector clean when not in use | Curt 55243 Custom 7-Way RV Blade, Select Ford F250, F350, F450, F550, Tow Package Required