R21-03-000 3/8 in General Purpose Air Regulator , 180 cfm Max. Flow – Regulators. The 2-gauge ports can be used as additional regulated outlet ports. Regulator can be serviced without removal from air line. Dial regulator features a transparent, pressure-calibrated, nonrising adjustment dial for quick adjustment of secondary pressure, ±1 psi. Can be mounted in any position so dial face is always visible. For the Max. Flow, the CFM flow is measured with 100 psig inlet adjusted to a set pressure of 90 psig and a 15 psig pressure drop. For the Adjustment Range, the working range of knob adjustment is designed to permit outlet pressures within their full range. Pressure adjustment beyond this range is also possible because the knob is not a limiting device.