... the total layer, forming a series of interchangeable pump(3” pump 3-1/2” pump 4” pump 4-1/2 ... pump), to meet different requirements of the pressure and displacement.3.Packing optional components, valve train, exhaust flange, sinks, ... Mpa)GPM(LPM)PSI(Mpa)GPM(LPM)PSI(Mpa)3”(76.2)0.55(2.1)28(104) ... 2,744(18.9)4”(101.6)0.98(3.7)49(185)7958(50.0)118(445) ... 8)441(1668)2,100(14.5)41/2”(114.3)1.24(4.7)62(235)6288(43. ...