UNILETS® GRF flanged conduit outlet box with explosionproof, dust-ignitionproof for use with threaded metal conduit. Furnished with internal ground screw and o-ring. Accurately tapped, tapered hub threads for tight, rigid joints and ground continuity. Furnished with covers. General purpose wiring. Function as sealing fittings when used with sealing covers. Internally threaded body with externally threaded cover. Covers have pry notches for bar or wrench.