nema 5-20 extension power cord - 15 foot, 20a, 125v, 12/3 sjt cable, 5-20p plug to 5-20r connector - ul listed - iron box part # ibx-1010 (15 ft, molded) iron box heavy duty nema straight blade extension cord with a 5-20p male plug to 5-20r female connector. rated for 20a, 125v, this cable features a "t-slot" on the female end, which allows you to plug both a 5-15p and 5-20p male into. cable is made with virgin plastic, a flexible yet durable strain relief, and is ul listed. quantity discounts and custom lengths are available upon request.