The pressure differential switched are broken, will need replaced. The hoses at the tip where it connects, is broke off. You get 20 pieces total, as pictured. AS IS.

The Metasys AP-VMA1420-0 Johnson Controls VAV Controller is a corded electric control designed for HVAC and refrigeration systems. Specifically made by Johnson Controls, this VAV control is compatible with their AP-VMA1440-0 model. It operates at 24V voltage and is manufactured in the United States. Ideal for use in business and industrial settings, this controller is a reliable and efficient solution for managing heating, ventilation, and air conditioning systems.