This is a complete Receptacle, Plug, and DEADEND back box set that includes a New Crouse Hinds ENR21201 explosion proof  20 amp 125 volt rated receptacle with EDS271 3/4" DEADEND back box. It is paired with the ENP5201 explosion proof 20 Amp plug. *Receptacles and plugs arrive from manufacturer in boxes of quantity 2. May arrive without manufacturers box for either.* This listing is for 1 receptacle and 1 plug with a back box.  Receptacle mates with appleton ECP2023 as well. I have other size back boxes available.
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