Grundfos UPM3 Flex 25-70 130 Circulator Pump for Underfloor Heating Buy Grundfos UPM3 Flex 25-70 130 high-efficiency circulator pump. Ideal for underfloor heating systems with 130mm spacing and 1½" BSP connections. High-efficiency Grundfos UPM3 Flex 25-70 130 circulator pump for underfloor heating systems. .
