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What is the difference between APJ/NPJ and DP Arktite plugs?

The APJ is a metallic Arktite plug (30-100 amp)   NPJ is the non metallic Arktite plug (30-100 amp).  Both are used with our Arktite non hazardous receptacles and some hazardous receptacles.  The DP plug is used for our EPC hazardous rated receptacle/circuit breaker enclosure.