Zoeller's Model 53 rugged cast iron/thermoplastic .3 hp submersible pump features a highly reliable float-operated two-pole mechanical switch, stainless steel screws and hardware, powder-coated epoxy finish, a non-clogging vortex impeller passing 1/2" spherical solids and 1 1/2" discharge. UL and CSA listed. Zoeller Pump Co.