UNILETS® GRJ conduit outlet box with explosionproof, dust-ignitionproof, raintight. Provides great resistance to corrosion, impact and shock. Accurately tapped, tapered hub threads for tight, rigid joints and ground continuity. Furnished with covers. General purpose wiring. Small, round conduit outlet boxes. Externally threaded body with internally threaded cover. Smooth, rounded integral bushing in each hub type box protects conductor insulation.