This AC WORKS brand protective adapter TTCB520 is a heavy-duty household adapter cable. This 1.5-foot cord is a NEMA TT-30P to NEMA 5-15/20R. The NEMA TT-30P is a 30 Amp, 125 Volt RV, travel trailer male plug. The NEMA 5-15/20R is a 15/20 Amp, T-blade female connector. The cable is an STW, 10/3, anti-cold weather cable staying flexible in extreme temperatures. The cord is super durable and typically used with RV power pedestals, generators, construction, and industrial equipment.