The Generac 6394 30-Amp 125-Volt Male Plug should be used with a 10-guage power cord for generators up to 3750 watts of power. This twist lock male plug comes in the NEMA configuration L5-30, is UL listed and made in the USA. The Generac 6394 30-Amp 125-Volt Male Plug can be used with generators equipped with a 30-Amp outlet including Generac model numbers: GP15000E, GP17500E, XP4000, XP6500E, XP8000E and XP10000E. Generac plugs should be installed by a professional electrician familiar with electrical wiring and code. Generac manufactures the widest range of power products in the marketplace including portable, RV, residential, commercial and industrial generators. Generac also operates three large factories that employ thousands of workers in the American Midwest.