ARO R37121-100 Air Regulator 1/4 NPT 59 cfm 250 psi

1/4 NPT Air Regulator for Pneumatic Lines

The ARO R37121-100 is a compressed air regulator built for 1/4 inch NPT female connections on both inlet and outlet. It suits workshops and industrial plants that need reliable pressure control on a main air line or branch circuit. The aluminum body and EPDM seals handle standard shop air up to the rated limits. Buyers who need a larger port size or integrated gauge should look elsewhere.

Sustained Flow at 59 cfm and 250 psi

Rated for a maximum flow of 59 cfm and a maximum operating pressure of 250 psi, the regulator maintains set pressure during continuous demand rather than only in short bursts. The knob adjustment lets operators dial in the working pressure while the system runs. Maximum operating temperature is 140 degrees F, so the unit stays stable in warm compressor rooms. No pressure gauge is included.

Panel Mount with Included Nut

A panel nut is supplied for through-panel mounting, and the 2 7/16 inch overall width fits standard cut-outs. Installation requires only threading the NPT ports and tightening the panel nut from the front. The most common issue is forgetting thread sealant on the 1/4 inch connections, which causes leaks at full pressure. Verify flow direction arrows before final tightening.