The York S1-02545293000 Expansion Valve (TXV) Evaporator 3/8" X 5/8" ODF is a thermostatic expansion valve designed to regulate refrigerant flow into the evaporator in compatible HVAC systems. It works by adjusting refrigerant delivery according to evaporator conditions, helping maintain proper superheat for efficient heat absorption. This component is used in compatible York air cond... https://www.partshnc.com/york-s1-02545293000-expansion-valve-txv-evaporator-3-8-x-5-8-odf