RV Pigtails 7 Way Heavy Duty 16' Trailer Cable. At one end the cable holds a 7-way round connector ready for hookup to the tow vehicle. At the other end seven color-coded wires sit ready to be spliced into the existing trailer wiring. Designed for use as a trailer cable. Features of RV Pigtails 41016 7 Way Heavy Duty 16' Trailer Cable Heavy-duty design 7-way round connector ready for hookup to the tow vehicle 7 color-coded wires ready to be spliced into the existing trailer wiring Designed for use as a trailer cable Cable Length: 16 ft. Package Contents: RV Pigtails 41016 7 Way Heavy Duty 16' Trailer Cable RV Pigtails 41016: 7 Way Heavy Duty 16' Trailer Cable