Humphrey - QE-2 - Quick Exhaust Valve 1/4in FNPT - Maximum Pressure Range; 0.0 - 150 PSI - Material; Zinc and Aluminum Die Cast - Maximum
Cycle Rate; 600.0 CPM

SMC - AQ2000-N02 - Quick Exhaust Valve 1/4in FNPT - Material; Aluminum Die Cast - Quick exhaust valves are used to quickly vent exhaust air at
the cylinder ports rather than porting the exhaust all the way back
through the valve