Perma-Cote, Conduit Coupling, Straight, Trade Size: 1 IN, Outside Diameter: 1.781 IN With Ribs, Material: Steel Body, Connection: Tapped, Threads Per Inch: 11-1/2 TPI, Metric Size Designator: 27, Effective Length L2: 0.6828 IN, Total Length Of Threads To Vanish Point L4: 0.9845 IN, Pitch At End Of Thread 3/4 In Taper E0: 1.2136 IN