Reverse Flow Check Valve Set, Mounting Location Torch, Compatible Gas Type Fuel, Oxygen, Inlet Connection Size 9/16 In.-18, Outlet Connection Size 9/16 In.-18, Inlet CGA Number (Fuel) CGA 023, Inlet CGA Number (Oxygen) CGA 022, Hose Fitting Size B, Body Material Brass, Inlet Thread Direction Left Hand, Right Hand, Product Type Check Valve Set, Series H697, Standards UL Listed