The Nordyne 669567R Thermal Expansion Valve Valve is a critical component that regulates refrigerant flow within HVAC systems. This is specifically developed for 3.5-ton R410A units. This valve regulates the amount of refrigerant that enters the evaporator coil, ensuring maximum performance and efficiency. https://www.partshnc.com/669567r-nordyne-txv-valve-35ton-r410a