hazardous area plug and socket / explosion-proof

With Nonmetallic Intraground? Enclosure. Explosionproof. 125 Vac, 20 Amp, 1 HP; 250 Vac, 20 Amp, 2 HP. Dead-Front Safety Construction.
NEC:
Class I, Division 1, Groups C, D
Class I, Division 2, Groups B, C, D
NEMA 3, 3R, 3RX, 4X, 7CD, 12
U-Line? N1 receptacles feature a Nonmetallic Intraground? enclosure that provides explosionproof protection while withstanding the most extreme corrosive environments. The plugs and receptacles also offer excellent resistance to flame, ultraviolet light, water, mold and fungi. The silicone gasket prevents entrance of moisture without interfering with the venting of cooled hazardous gases and vapors. An embedded aluminum grounding grid provides a complete grounding system with no need for field work and no extra grounding wires or parts.

Features
High strength thermoplastic polyetherimide mounting box, silicone gasket
Nonmetallic construction with metal imbedded grounding grid
Feed-thru or dead-end grounded 1/2" or 3/4" conduit openings for threaded conduit
Special grounding wire provides safe grounding when cover is removed
Excellent resistance to flame, ultraviolet light, water, fungi and mold
Excellent conduit connection strength
Silicone gasket, specially designed for the labyrinth-path joint, prevents entrance of moisture without interfering with the venting of cooled hazardous gases and vapors
Explosionproof when sealing fittings (sold separately) are installed at each conduit entrance
The U-Line Interchanger? ECP plug is suitable for use in refineries, petrochemical plants and other areas where ignitable gases are present