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Genuine OEM Trane MAYTXVACHP1830A thermostatic expansion valve (TXV), sized for 1.5-ton heat pump duty in 2-2.5 ton air handlers. The TXV precisely meters refrigerant into the evaporator coil — when it sticks or fails you'll see poor cooling, frozen coils, or high superheat and inefficient operation. This factory valve ensures proper refrigerant control and rated efficiency for your Trane system.