Gas Regulator, Minimum Outlet Pressure (Oxygen) 0 psig, Number of Stages Single Stage, Diaphragm Material Neoprene, Duty Rating Medium/Standard Duty, Inlet Connection Size 0.825 In.-14, Inlet Connection Type NGO, Inlet Thread Direction Left Hand; Right Hand, Maximum Inlet Pressure 400 psig, CGA Number (Oxygen) CGA 540, Outlet Connection Gender Male, Outlet Connection Size 9/16 In.-18; 9/16 In.-18, Outlet Connection Type UNF, Outlet Thread Direction Left Hand; Right Hand, Body Material Brass