3/4 in threaded plastic insulating bushings are used on 3/4 in threaded rigid or IMC conduits to prevent wires from being damaged as they pass through the end of the conduit. Garvin Industries insulating bushings provide smoothly rounded surfaces at the end of raceways. Garvin Industries threaded insulating bushings are made of high impact polypropylene that is temperature rated at 105 deg C and easily screws on to threaded conduits. GARVIN® Rigid Bushing, Threaded, 3/4 in Conduit, Insulated, Plastic, White, 0.8 in ID x 1.33 in OD x 0.47 in L Dimensions