ARO R37331-100 Regulator

ARO R37331-100 Regulator is a 2000-Series relieving regulator from ARO-Flo designed to deliver stable downstream pressure in compressed-air systems. It features 3/8" NPT ports and a 0-140 psi adjustable setpoint, with a maximum supply pressure of 250 psi and a flow capacity of up to 179 CFM, making it suitable for demanding tools and automation circuits. The aluminum regulator body houses a nitrile + acetal diaphragm, brass + nitrile valve, and nitrile O-rings, with a gauge cover in nylon + polycarbonate and an acetal adjustment knob; a panel nut is included for quick mounting. It provides a flush-mount gauge with a settable fan feature and is available as a relieving regulator to vent excess downstream pressure. The unit weighs about 1.47 lb and measures roughly 3.15 inches wide by 5.47 inches high, with an operating temperature range of approximately 23 to 140°F. This model is commonly used in metalworking, manufacturing, ship repair, fabrication, assembly lines, oil and gas, and aerospace environments where precise, consistent pressure control is essential to protect tools and downstream equipment.