🔌 NEMA 6-20R, 15/20 Amp, 250 Volt HVAC/Power Tool Female Connector. 🔌 NEMA 6-50P, 50 Amp, 250 Volt, 3-Prong Welder Male Plug. NEMA 6-50P. NEMA 6-20R. Heavy-duty, compact adapter converting a 50 Amp, 250 Volt welder plug to a 15/20 Amp, 250 Volt T-blade female connector.