21 Series Pump Right Cw Rotation Tandem Unit 2 Stages Sae 4 Bolt B Sec 7/8-13 Spline Shaft With OB Bearing First Stage 1-1/2 Gear Width Gear Housing Orb #20 Inlet Port Orb #16 Outlet Port Bearing Carrier Blank Inlet Port Blank Outlet Port Second Stage 1-1/2 Gear Width Gear Housing Orb #20 Inlet Port Orb #16 Outlet Port Unported Port End Cover Standard Studs