The Reliance Controls L1420P Male Cord Plug is the NEMA L14-20P configuration. Since 1909, Reliance Controls Corporation has contributed more innovations that any other single manufacturer and has been awarded over 85 patents on manual transfer switches, time switches and accessories. Reliance Controls Corporation specializes in the manufacturing of a wide variety of electrical products. The primary product line consists of heavy duty time clocks and controls, generator accessories, transfer switches and transfer panels for portable generators and inverters. And after over a century of innovation, Reliance Controls Corporation has built an enviable reputation for high quality, superior engineering and exceptional customer service.The Reliance Controls 20 Amp plug is designed for use with Reliance generators up to 5000 watts. The NEMAL14-20 plug is UL listed and is covered by a 5-year warranty.