The Grundfos 595926 Comfort Valve, previously known as part #595915, is an essential component for efficient hot water recirculation systems. It helps deliver instant hot water at the tap while reducing water waste, enhancing convenience, and promoting sustainability. Designed for easy installation, the valve fits directly under sinks and works seamlessly with Grundfos Comfort System ... https://www.partshnc.com/595926-grundfos-comfort-valve-used-to-be-part-595915