Series 1535 cast iron centrifugal pumps are robust, close-coupled, foot-mounted pumps intended to pump water through closed loop systems for hydronic heating and cooling, primarily in commercial settings. These pumps are ideal in applications where front end suction and top discharge is needed. The Series 1535 features a back pull-out design, which allows the pump to be serviced without disturbing system piping. Series 1535 pumps can be mounting either vertically or horizontally, providing a wide range of application flexibility. High quality, permanently lubricated ball bearings, along with a self-flushing mechanical seal, on the Series 1535 means years of dependable service. The 355S is a single phase pump and includes a bronze impeller, a 1-1/4" end suction, and a 1" top discharge.