The Trane KIT12480 Flow Switch Kit U40100 is a monitoring and safety component designed to detect fluid flow in hydronic HVAC systems. It operates by sensing water movement through the system and sending a signal when adequate flow is present or interrupted, helping protect equipment from operating under unsafe conditions. This flow switch kit is commonly used with compatible Trane ch... https://www.partshnc.com/kit12480-trane-flow-switch-kit-u40100