The Climatemaster 33B0043N07 3/8 Inch x 3/8 Inch ODF 2 Ton 30 Inch Thermal Expansion Valve (TXV) is a precision HVAC component designed to regulate refrigerant flow in air conditioners, heat pumps, and refrigeration systems. It works by automatically adjusting the amount of refrigerant entering the evaporator based on cooling demand, helping maintain optimal system performance. Engine... https://www.partshnc.com/33b0043n07-climatemaster-38-x38-odf-2ton-30-cap-txv