• Oil-filled motor and cast iron motor housing for optimal heat dissipation which prevents the pump from overheating
• Automatic pump with a time-tested, reliable, preset, built-in snap action switch that makes for easy installation
• Cast Iron vortex impeller to allow free passage of solids which prevents clogging and lessens downtime

The 1/2 HP Model M137 automatic Sump Pump is designed to remove groundwater from basement sump applications. This corrosion resistant pump will provide the dependability expected from a Zoeller pump. Backed by a 3-year warranty, every pump is submerged in water and tested to its published performance curve, ensuring it meets your expectations and delivers peace of mind right-out-of-the-box.