Master Plumber, 1/2 HP, 115V, 4" Stainless Steel Submersible Well Pump, 2 Wire 10 GPM, For Wells Depths Up To 150', 4" Inside Diameter Or Larger Wells, Patented Floating Stack Design For Sand Resistance & Reduced Sand Locking, Corrosion Resistant Stainless Steel Pump, & Motor Housing, 1-1/4" Discharge Connection, Precision Molded Impellers & Diffusers, Includes Built In Check Valve.