51 Series Pump Right Cw Rotation Tandem Unit 2 Stages Sae 4 Bolt C Sec 1-1/4-14 Spline Shaft With OB Bearing First Stage 1-3/4 Gear Width Gear Housing Split Flange #24 1-1/2 Inlet Port Split Flange #16 1 Outlet Port Bearing Carrier Common Inlet No Outlet Second Stage 1-1/2 Gear Width Gear Housing Split Flange #24 1-1/2 Inlet Port Split Flange #16 1 Outlet Port Unported Port End Cover Standard Studs