Grundfos 3-speed stainless steel circulator pump with a two-bolt flange connection and check valve. This pump's motor is 1/12 HP, single phase, and 115v. It has a flow range of 0-25 gpm and a head range of 0-18 feet. UPS Series pumps feature a canned rotor design, meaning the pump and rotor form an integral unit without a shaft seal. This "built-in" motor provides a longer life and better performance, as well as, quiet operation. The pump's bearings are lubricated from the liquid being pumped through the unit, eliminating the need for frequent lubrication. The UP Series impeller is made out of corrosive-resistant, non-metallic material.