Trane MAYTXVACHP3642A Thermal Expansion Valve Kit (TXV) is a refrigerant flow-control component designed for compatible Trane air conditioning and heat pump systems. It regulates refrigerant entering the evaporator coil according to system load and superheat conditions, helping maintain proper refrigerant flow throughout the cooling cycle. Used in residential and light commercial HVAC... https://www.partshnc.com/maytxvachp3642a-trane-txv-valve-kit