The Climatemaster 33B0043N09 1/2 Inch ODF 3 Ton 15BLD 30 Inch Cap Thermal Expansion Valve (TXV) is a high-performance HVAC component designed to precisely control refrigerant flow in heat pumps, air conditioning units, and refrigeration systems. It works by sensing evaporator conditions and adjusting refrigerant delivery to match system demand, ensuring efficient heat transfer and sta... https://www.partshnc.com/33b0043n09-climatemaster-12-odf-3ton-15bld-30-cap-txv