Zoeller Model M57 Mighty-Mate Automatic Cast Iron Effluent Pump - 115 V, 0.3 HP

Standard Features

• Float-operated, submersible, 2-pole mechanical switch and variable level, long-cycle systems available
• Corrosion-resistant, powder-coated epoxy finish
• No sheet metal parts to rust or corrode
• Stainless steel screws, switch arm, guard, and handle
• No screens to clog
• Watertight, neoprene square ring between motor and pump housing
• Solid, buoyant, polypropylene float
• Oil-filled, hermetically-sealed, automatic reset thermal overload protected motor
• Upper and lower sleeve bearings running in bath of oil
• Entire unit pressure-tested after assembly
• Carbon and ceramic shaft seal
• Maximum temperature for effluent or dewatering: 130 °F (54 °C)
• Passes 1/2” (13 mm) spherical solids
• 1-1/2” NPT discharge
• On point: 7-1/4” (18 cm)
• Off point: 3” (8 cm)
• Major width: 10-3/32" (26.2 cm)
• Major height: 10-1/16" (25.6 cm)
• Watertight and dust-tight

Within this series exist several distinct models. Though performance remains the same, the pumps' material construction is what varies. What are the differences between each model? Glad you asked...

Model 57 (60 Hz only)

• Cast iron switch case, housings, base, and impeller
• Stainless steel guard and handle
• Cast iron sleeve bearings