Cam and Groove Coupling Socket Body Material Aluminum Type D Coupling Size 4 in Female Connection Type NPT Hose Fitting Size 4 in FNPT Max Working Pressure @ 70 F 250 psi Plug Outside Dia 6 25/32 in Socket Inside Diameter 4 47/64 in Gasket Material Nitrile Overall Length 3 7/16 in Includes Locking Arm Yes Thread Size 4 in -8