21 Series Pump Right Cw Rotation Tandem Unit 2 Stages Sae 4 Bolt B Sec 7/8-13 Spline Shaft Without OB Bearing First Stage 2 Gear Width Gear Housing Orb #20 Inlet Port Orb #16 Outlet Port Bearing Carrier Common Inlet No Outlet Blank Inlet Port Blank Outlet Port Second Stage 1/2 Gear Width Gear Housing Blank Inlet Port Blank Outlet Port Port End Cover Orb #16 Rear Inlet Port Orb #16 Rear Outlet Port Standard Studs