Features40 mil gray PVC exterior coating
2 mil red urethane interior coating over galvanized threadsSealing sleeves on both ends prevent corrosive liquids and vapors from attacking threaded jointsMolded external ribs on 1/2 to 4 in to prevent tool damage during assemblyCouplings are straight tappedPVC coated rigid metal conduit couplings with urethane interior coating connects coated conduit sections electrical continuity is maintained across assembled joints27 metric size designator0.6828 in effective length1.2136 in pitch at end of thread 3-gang/4 in taper0.9845 in total length of threads to vanish point11-1/2 TPI SpecificationsStandards/Approvals: UL Listed Standard 6