Hypro Diaphragm Pump 9910-D252 Does NOT include gearbox and regulator (see 9910-D252GRGI, sold separately). You CANNOT fit the gearbox on the D252 Pump. Max. 6.5 gpm ; Max. 290 psi ; Max. 650 rpm ; Max. 140 F 3/4" hose barb inlet, 1/2" NPT outlet 3/4" solid shaft 2 diaphragms (semi-hydraulic)