1-1/4" check valve service part OV32 is designed for the Grundfos ALPHA 26 and UPSe 26 high-efficiency circulator pumps. This replacement component is essential and helps maintain proper system flow by preventing backflow within the pump system. Compatible pump models include UPSe 26-99 UPSe 26-150, ALPHA 26-99, and ALPHA 26-150.