High Purity Gas Regulator, Mounting Type Cylinder, Number of Stages Single Stage, Compatible Gas Type Hydrogen, Methane, Control Type Knob, Maximum Inlet Pressure 3,500 psig, Inlet Connection Size 0.825 In.-14, Inlet Connection Gender Male, Inlet Connection Type NGO, Inlet Thread Direction Left Hand, Outlet Pressure (Maximum) 15 psig, Outlet Connection Gender Male, Outlet Connection Size 1/4 in, Outlet Connection Type NPT, Gas Purity Rating 99.9 Percent