The Amana-Goodman TX5N4 Thermal Expansion Valve (TXV) Valve Kit, designed for R-410A refrigerant in 3.5-5 ton HVAC systems, is essential for regulating refrigerant flow in your air conditioner or heat pump. This crucial part responds to temperature variations to provide the best possible cooling or heating performance, similar to an automated faucet. The TXV valve maximizes system lif... https://www.partshnc.com/txv-valve-kitr-410-3