Description Manuals Videos Articles Popular Accessories Clemco 21323 - Auto Quantum Valve AQV Piston Stop This is an OEM replacement Piston Stop for Auto Quantum Valve AQV Item # 2 Customers Also Viewed Filter, air (MS), 1 inch AD (SMC) #22425 $304.01 Clemco Auto Quantum Grit Metering Valve #24447 $873.83 Clemco Blast Machine Cover, 24 inch Diameter #02336 $173.44