This Little Giant 509460 ES40M1-10 is an energy-saving, high-performance, fully-submersible sewage/effluent pump. It can also serve as a high-capacity sump pump. Designed for the professional plumbing contractor, this pump has a 4/10 HP Permanent Split Capacitor motor with high starting and running torque that draws less energy while delivering greater pump flow. The Little Giant 509460 ES40M1-10 submersible sewage pump is built to last with an epoxy-coated cast iron housing, stainless steel hardware, a mechanical seal, upper and lower ball bearings, and an oil-filled motor housing. This pump also has thermal overload protection. The recessed, vortex impeller is constructed of tough, engineered composite materials that reduce clogging and will pass 2" spherical solids. This Little Giant 509460 ES40M1-10 submersible sewage pump provides automatic operation that can be controlled with either a diaphragm pressure switch or a wide-angle float switch. Little Giant and its parent company, Franklin Electric, have been making pumps for over 70 years. The quality, durability, and dependability of their products have made them a world leader in pumps of virtually every variety.