Air-operated Double Diaphragm PumpAir Operated Diaphragm Pump is one of the best pumps to put in use popularly in the world. It's suitable for pumping chemical liquids , food sauce, industrial sludge and any liquids with solids . Our pumps have the best abrasive resistance about air valve design. We also have Non-stall and Non-thimble patent of pump in the world . This design can save 15~20% air consumption in the same flow rate to compare with other AOD pumps.