Conntek P515520 NEMA 5-15P to 5-15/20R Extra Heavy Duty Pigtail Adapter, UL Listed Plug (Male): NEMA 5-15P (Standard 3-Prong Household Plug) Connector (Female): NEMA 5-15/20R (T-Blad eslot accepts 15 or 20 Amp equipment plugs) Cable: STW 12/3 (Industrial Grade) Max Rating: 1,875 Watts UL, c(UL) Listed