The Navien 30022124A Mixing Valve for NPE-2/NPN Tankless Water Heaters is a precision component designed to regulate and blend hot and cold water for consistent outlet temperatures. It functions by automatically adjusting water flow to maintain optimal temperature levels during operation. Commonly used in Navien tankless water heating systems, this valve enhances user comfort, prevent... https://www.partshnc.com/30022124a-navien-tankless-water-heaters-mixing-vv-npe-2npn