The Trane 4Aytxvh3G4248A-3 4Ton R410A Thermal Expansion Valve (TXV) is a precision refrigerant metering device designed for R-410A air conditioning and heat pump systems. Engineered for select Trane 3–4 ton units, it regulates refrigerant flow into the evaporator coil based on temperature and load conditions. By maintaining proper superheat, the valve optimizes heat transfer efficienc... https://www.partshnc.com/4aytxvh3g4248a-trane-3-4ton-r410a-txv