⅜" Diameter Bore, ¾" StrokeA small hand-operated, piston-type hydraulic pump used to replenish boiler water while boiler is in use and under pressure. Also used to hydrostatically test your boiler and other hydraulic applications. These pumps have been known to produce up to 400 psi.Constructed of a cast bronze body, brass end cap and packing nut, with stainless steel piston and valves.Overall dimensions are 3¾" length, 4" height, 1¾" width, threaded 5/16-27 (1/16 NPT).Kit consisting of one bronze casting, all bar stock, hardware, complete working drawings, etc.Options:PM Research - Boiler Pump Kit - Unmachined - NOTE: Machining & Assembly required.PM Research - Boiler Pump Kit - Machined - Assembly required.