Appleton GRLB100 LB-style dust-ignitionproof explosion-proof conduit outlet box with cover for 1 in conduit, designed for use with threaded metal conduit. The unit features a malleable iron body and aluminum cover, is equipped with an internal ground screw and O-ring, and comes with two 1 in GRLB hubs; it has a cover opening of 3.38 in and an 18 cu in internal volume, with overall dimensions of about 3-3/4 in high by 3-3/4 in wide by 2-1/4 in deep. It is epoxy powder coated for durability and is part of Appleton's GRLB series UNILETS conduit outlet boxes.
