3 Inch Air Operated Diaphragm Pump China This product is mostly used in absorb and delivery the wastewater from sewage treament plant銆乵anufacturing plant銆乮t has anti-corrosion, not stop up, no freeze and so on. Weight : Aluminium alloy: 13 Kg, Cast iron: 21 Kg, Stainless steel: 20 Kg.3 Inch Air Operated Diaphragm Pump China website:http://www.zqaodd-pumps.com/air-operated-diaphragm-pump/3-inch-air-operated-diaphragm-pump/