DRUMMOND 1/2 HP Submersible Sump Pump with Heavy Duty Snap-Action Float Switch, 4400 GPHThis heavy duty commercial grade DRUMMOND sump effluent pump quickly removes gray water and groundwater from basements, crawl spaces, and septic systems. The clog resistant vortex impeller can transfer gray water with 1 2 in. diameter solids. The cast iron construction and heavy duty snap action float switch provide durability and long service life. Fully submersible pump Maximum flow: 4400 GPH (gallons per hour) at 0 ft. Maximum head lift: 35 ft. at