This AC WORKS brand adapter [S1430630-018] is very durable with a flexible design. It is a NEMA 14-30P to NEMA 6-30R. The NEMA 14-30P is a 30 Amp, 125/250-Volt, 4-prong male plug. The NEMA 6-30R is a 30 Amp, 250-Volt, 3-prong HVAC female connector. The product is heavy-duty STW 10/3 30Amp Copper Wire with 600Volt Jacket. Included with your purchase is a 5-year limited warranty.