Grundfos circulating pump 1/12 HP for solar domestic hot water heating. Stainless steel construction with cast iron volute. Standard flange mount, rotated 90 degrees. Suitable for drainback systems. Includes removable check valve and three speed operation. Maximum head 29 feet. Note 98371748 & 99528125 are same pump, however 99528125 has SunEarth OEM faceplate.