Zoeller M137 Automatic Cast Iron Sump Pump 1/2 HP
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M137 Zoeller Automatic Cast Iron Sump Pump 1/2 HPCastings - Model 137, all cast iron ASTM class 25, 25000# tensile strength.Non-Clogging vortex impeller design.Corrosion resistant powder coated epoxy finish.Float operated 2-pole mechanical switch. (Automatic units only)Durable cast construction. Cast switch case, motor and pump housing, base and impeller. No sheet metal parts to rust or corrode.Upper and lower sleeve bearings running in bath of oil.Carbon and ceramic shaft seal.Stainless steel screws, bolts, handle, guard, and arm and seal assembly.Passes 5/8 inch spherical solids.