Goulds Water Technology 18GBS2012N4 Repair Parts, GB Series Stainless Steel Booster Pump, Exploded View Part Breakdown Diagram & Xylem PDF Manual. Replacement Discharge Head, O-Ring, Casing, Bearing & Spider Assembly, Klip Ring. Diffuser, Impeller, Bowl, Shim, Shaft, Mechanical Seal, Motor Adapter, Screw, Handle, Base, Pipe Plug. Coupling, Deflector, Motor, Power Cord, Suction Discharge Hose, Pressure Gun, Adapter.