Vesta’s Air-Operated Double Diaphragm (AODD) FLAP VALVE pumps offer superior handling of solids like sand, stones, trash, nuts, bolts, etc. up to 70mm in diameter. With the conventional ball valve design AODD Pump and the new FLAP VALVE design sharing the same “Heart” (Centre block, Inner & Outer Diaphragm housings & Diaphragms) make converting the conventional ball valve design to the new FLAP VALVE design very simple and cost-effective.