PVC Coated Conduit Nipple, 5 Inch/129 Metric Pipe Size x 18 Inch/457.2 Millimeters Nipple Length, Nominal .002 Inch (2 mil) Blue Urethane on Interior, Minimum .040 Inch (40 mil) PVC Coating on Exterior, Blue Urethane Coating Over Threads, Hot-Dip Galvanized Rigid Steel, Gray