The ALCO CONTROLS ZZC 3-1/2 RW 60 THERMO EXPANSION VALVE is a reliable and high-quality part designed for use in HVAC systems. This expansion valve, manufactured by Alco Controls in the United States, is compatible with central furnaces, central air conditioners, and dual fuel split air conditioning systems. Weighing 2 lbs, this valve is essential for controlling the expansion of refrigerant in the system, ensuring optimal performance and efficiency.