Gentec Quick Connector Sets, Regulator-to-Hose Connector Set, 145 psi, Fuel/Oxygen (331-QC-RHPRSP) EachBuilt in automatic reset check valve prevents reverse flow of gases by cutting off the gases under back pressure Before disconnection, gas must be shut off at regulators Color codes provide speed and safety QC RHF A has A Connection Gas Type = Fuel Gases, Oxygen Connection Type = Male Female Outlet Body Thread TPI or Pitch = 9 16 in 18 Pressure = 29. 00 psi [Max], 145. 00 psi [Max] Includes = QC RHF, QC RHX, Check Valve Applications = Regulator, Torch