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 joints103 metric size designator1.3 in effective length4.3344 in pitch at end of thread 3-gang/4 in taper1.7337 in total length of threads to vanish point8 TPI SpecificationsStandards/Approvals: UL Listed Standard 6