This AC WORKS brand protective adapter L1420CB520 is a heavy-duty generator adapter cable. This 1.5-foot cord is a NEMA L14-20P to NEMA 5-15/20R. The NEMA L14-20P is a 20 Amp, 4-prong generator plug. The NEMA 5-15/20R is a 15/20 Amp, T-blade female household 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 a generator, construction, and industrial equipment.