... will determine if you need a positive displacement pump or centrifugal pump. In general, positive displacement pumps (diaphragm, ... if you were able to pull a perfect vacuum at sea level. However, few pumping systems ... level and no pump on the market is able to develop a perfect vacuum on its inlet ... , Mainframe box, Controller, Inverter, Pump, Pump protector, cable(18M), Wire rope Do not includeWater ...