This pump is a GRUNDFOS UPS32-80 180 Inline Circulating Pump, Cast Iron Construction for Heating & Cooling Applications. 32mm Ports,180mm between centres.
Requires Unions see below.
Cast Iron Construction for Heating & Cooling Applications. 25mm Ports,180mm between centres
The GRUNDFOS UPS32-80 can be used in both open and closed systems. UPS pumps are of the canned-rotor type, i.e. pump and motor form an integral unit without a shaft seal and with only two gaskets for sealing. The bearings are lubricated by the pumped liquid.