Powercon NAC3MPX Yellow 20 Amp 250VAC Power Male Panel Recepticle Connector. 

Male chassis connector, power-in, 1/4'' flat spade terminals. The powerCON TRUE1 is a locking 16 A (USA: 20 A) true mains connector. It replaces appliance couplers wherever a very rugged solution is required.

• True mains connector with breaking capacity (CBC)
• Lockable 16 A (USA: 20 A) single phase connector
• Easy and reliable twist lock system