This is the appropriate receptacle to install in your control box to accept a plug from your heating element supporting up to 240v 5500 watt (up to 30 amps). The whole unit sits recessed into the box/panel so that nothing sticks out. You will need some room in the box for it.
Material of Construction Ethylene Propylene Thermoplastic
Number of Wires 3
NEMA Configuration 6-30R
Note that we source these plugs from several vendors to keep the price as low as possible so the one you receive may not be exactly as pictured.
Works great 
