Conntek PL1420L620 L14-20P to L6-20R Pigtail Adapter Plug (Male): NEMA L14-20P (20 Amps 125/250 Volts, 4-Prong Locking) Receptacle (Female): NEMA L6-20R (20 Amps 250 Volts, 3-Prong Locking) Cable: STW 10/3 Converts an L14-20R outlet to a L6-20R