The Carrier HK 06NB 124 Pressure Switch is a unit designed for use in heating, cooling, and air systems. It is a high-quality product from the reputable brand Carrier, known for its reliability and durability. This pressure switch is a single unit and is specifically designed for controlling the pressure in heating, cooling, and air systems, ensuring optimal performance and efficiency. Ideal for home improvement and home and garden projects, this pressure switch is a crucial component for maintaining a comfortable environment.