MRCOOL H4TXV01 Signature Series 1.5 to 2.5 Ton Thermostatic Expansion Valve Kit is an HVAC system component designed to regulate refrigerant flow for optimal cooling and heating performance. It works by automatically adjusting the amount of refrigerant entering the evaporator coil based on system demand, helping maintain efficient operation and proper temperature control. Designed for... https://www.partshnc.com/mrcool-signature-txv-h4txv01