Master Plumber, 1/2 HP, 115V, 4 in. stainless steel submersible sumps. Economical, energy-efficient pumps for 4in. wells or larger. They provide the optimum amount of water and pressure for general home and farm use. 2 wire pump and requires no control box. Fits 6 in. inside diameter or larger wells, patented floating stack design for sand resistance and reduced sand locking, corrosion resistant stainless steel sump, and motor housing, 1-1/4 in. discharge connection, precision molded impellers and diffusers, includes built in check valve, no control box needed, 3 year warranty. Performance: GPM 20 ft. = 13.2 in. 40 ft. = 12.2 in., 60 ft.= 10.9in., 80ft. = 9.6 in., 100 ft. = 6.1 in., 150 ft. = 2, 4 in.