Fairchild Industrial Products P/N 30213BP, Pneumatic Back Pressure Regulator, 0-2 PSIG Adjustable Range, N.A. Max. Supply Pressure, 40 SCFM Nominal Flow Capacity, Aluminum Body, Buna-N Diaphragm, Knob Actuator, 1/4" Water Column Sensitivity, 3/8"NPT Female Pressure Conn., , Model 30BP Pneumatic Back Pressure Regulator Valve
See Product Datasheet for Complete Specifications.