Cam and Groove Adapter Plug Body Material Aluminum Type A Coupling Size 3 in Female Connection Type NPT Hose Fitting Size 4 in FNPT Max Working Pressure @ 70 F 100 psi Plug Outside Dia 3 39/64 in Overall Length 4 1/8 in Includes Locking Arm Yes Thread Size 4 in -8 Plug Length 2 in