Grundfos Pump, Circulator 115V 1/6 HP Cast IronThe Grundfos UPS5044F (52722557)is a 3speed cast iron circulator pump with a builtin check valve. It is also a highvelocity model designed for use in systems with high flow and low to medium pressure drop characteristics. This Grundfos model is for use in open and closed loop applications, including radiant heating, baseboard heating, solar, and fan coils. The three speeds include, low, medium, and high in order to adjust the pump's performance to match the necessary system requirements. Includes two Orings gaskets.