The Taco I100T4R-1 1-Inch Mixing Valve is a hydronic heating component designed to regulate water temperature by blending hot and cooler water from separate sources. It automatically adjusts the mixing ratio to deliver consistent, controlled water temperatures throughout the system. Commonly used in compatible boilers, radiant floor heating systems, and hydronic HVAC applications, thi... https://www.partshnc.com/i100t4r-1-taco-1-inch-mixing-valve