Lennox 13Y20, Thermal Expansion Valve, 4 TonCondition:* New Surplus Stock, In OEM Packaging. As Pictured. Additional Notes:* 4 Ton R410TXV Valve* The Lennox 13Y20 Expansion Valve Assembly 4 Ton 3/8″ internal thread valve for R-410A refrigerant with Square Flange terminal to TC connection.* Lennox Expansion Valve 13Y20/328157, For use in 4-Ton systems only. * The valve is designed for both Multi-Position (MP) and Single-Position (SP), indoor rooftop pack applications* Large-capacity replacement valve for Lennox Air Conditioners. Use in place of two 8 1/2 ton valves.* The Lennox 13Y20 Expansion Valve (Temperature & Volume Control) assembly is a direct replacement for Lennox brand four-ton package units.* Expansion valves, or TXVs, are used to solve cooling problems by increasing or decreasing the amount of refrigerant in the system. Lennox 13Y20