The Steam Boiler Feed Pump is a most interesting model to build requiring good workmanship. The pumping parts are gunmetal & stainless steel. The pump will work at speeds from 200 to 10 strokes per minute. The stroke may be shortened by moving the two collars closer together. Engine Description: Steam Boiler Feed Pump Set of Unmachined Castings, Fixings & Drawings. Specifications: Length: 6 Inches. Bore: 1/2 Inch. Stroke: 3/4 Inch. Contents: Cast Iron: Frame. Gunmetal: Tappet, back cover, front cover, steam chest, cylinder pump body, pump head. Sundries: Detailed drawings, gasket material, aluminium lagging, fixings pack. Manufacturer: Stuart Models Model / Part No: Steam Boiler Feed Pump Unmachined Set of Castings (34-50-72475)