Grundfos 59896771 1/12 Horsepower Stainless Steel Circulator Pump Stainless steel Flow range: 0- 20.5 U.S. GPM, Head range: 0- 9.7-Feet Motors: 2 Pole, Single Phase, 115-Volt SF = Two bolt flange connection (GF15/26) Removable check valve eliminates the need for an in-line flow check