H501 – High Pressure Quick Coupling 10,000 psi ( Plug / Coupler ) NPT (R) Thread
H301 – ISO16028 Flat face type Quick Coupling Flat Face quick release coupling ( Plug / Coupler ) BSPP (G) Female Thread
H001 – HYD quick connector ( Quick Coupling ) ISO 7241-A Series A Interchange ( Plug / Socket ) BSPP (G) Female Thread