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 joints21 metric size designator0.5457 in effective length0.9677 in pitch at end of thread 3-gang/4 in taper0.7935 in total length of threads to vanish point14 TPI SpecificationsStandards/Approvals: UL Listed Standard 6