31 Pump; Tandem 2 Stages – Extended Studs Top; Cw Rotation W O.B. Bearing; Sae 2 Bolt B; 1” – 15 Splines; First Stage: 1-3/4” Gear, Housing Blank Inlet #12 Orb Outlet; Bc #24 Orb Inlet Thru Hole, Blank Outlet; Second Stage: 1-3/4 Gear, Blank Inlet, Blank Outlet; Pec Blank Inlet And #12 Orb Outlet.