Ingersoll Rand ARO R37331-100 Air Pressure Regulator

Ingersoll Rand ARO R37331-100 is a 3/8" NPT air regulator from the ARO-Flo 2000 Series that delivers clean, controlled downstream pressure in pneumatic systems. It supports up to 250 psi inlet pressure and provides a regulated output range of 0–140 psi, making it suitable for general industrial tools, actuators, and spray equipment that require stable pressure. The regulator body is aluminum for light weight and durability, and it offers a 1/8" gauge port for pressure monitoring; it is a relieving regulator to vent excess downstream pressure and protect components downstream. With a flow capacity of about 179 standard cubic feet per minute (SCFM) at typical operating conditions, it handles moderate air demand without major pressure drop. Operating temperature range is 23°F to 140°F (-5°C to 60°C), aligning with typical workshop environments. The unit uses 3/8" NPT connections for inlet and outlet, and is identified by the R37331-100 designation as a standard aluminum regulator in the 2000 Series. This regulator is commonly installed downstream of a compressor or FRL assembly to provide precise, adjustable pressure for pneumatic tools, grippers, and spray systems, balancing reliable performance with safe, regulated operation under varying load conditions.