Forney 75581 Regulator, Full Size Air Line, 3/8-Inch Female NPT Ports Full-Size regulator with 3/8-Inch NPT 80 cubic feet per minute (CFM) at 250 PSI, 5 to 150 PSI Secondary aspiration plus balanced valve provides quick response and accurate pressure regulation Rolling diaphragm for extended life Removable non-rising knob for panel mounting and tamper resistance