1.Pneumatic Diaphragm Pumps, 2.Air inlet NPT 1/4,1/2,2 3.IMPA:591601,591602,591605 4.T2,T4,T8 Pneumatic Diaphragm PumpsIMPA:591601Air inlet NPT 1/4 CODE591605591601591602ModelT1T2T4Standard CasingAluminumSuction LiftDry4´17´18´Wet30´31´28´Air Inlet NPT1/4"1/4"1/2"591602Air inlet NPT 1/2,