ARO Diaphragm Pump Parts and Accessories - Pulsation dampeners reduce pressure fluctuation found in normal diaphragm and piston pump operation and can help eliminate material foaming, material pulsation, hydraulic shock or material splashing. Automatic Air Adjustment - compensates for fluctuations in fluid pressure without operator intervention. Significant Pulsation Reduction - Shock blockers deliver an average 60 - 80% pulsation reduction in high back pressure applications. Built for High-Flow / Aggressive Fluid Applications - the 2" models can handle up to 159 cubic inch maximum fluid volume, and 3" models up to 509 cubic inch maximum fluid volume. Broad Material Range for Compatibility - choose from PVDF, polypropylene, groundable acetal (1" models) or aluminum, cast iron or stainless steel (2" and 3" models) body materials for optimum pump-to-pulsation dampener compatibility. Broad Diaphragm / Bladder Fluid Compatibility - choose from Santoprene, Nitrile, PTFE, Hytrel, Viton or Urethane for optimum fluid-to-diaphragm compatibility.