Shop Nilight 15 Amp 30 Amp to 50 Amp RV Y Splitter Adapter Cord 5-15P TT-30P Male Plug to 14-50R Female Receptacle Heavy Duty Electrical STW Wire Waterproof Cord for RV Camper Van Trailer in high quality, support 2 Years Warranty. Constructed with 100% pure copper with full 10 gauge wires ensuring high conductivity. The wires are stranded copper, it’s very flexible and the STW jacket is very durable.