This heavy-duty cable features a female IEC 60320 C19 connector on one end and a male NEMA L6-20P connector on the other end. Heavy Duty Power Cord - Locking NEMA L6-20P to IEC 60320 C19_ 12AWG_ 2 Connect network servers and other peripherals that require heavier-gauge cabling with a PDU; UPS; or other AC power source with a NEMA L6-20R locking outlet. Simply mate the female C19 connector with the male C20 connector on your device or power adapter; then plug the NEMA connector into a nearby UPS or other AC power source. Updated Nov 12; 2019 Locking plugs have the pins arrayed in a circular manner and is inserted and twisted to lock in place.