The Carrier HK06MB011 Pressure 3-Switch Assembly is a replacement safety and monitoring component designed for use in compatible furnaces, boilers, and other HVAC systems. It works by monitoring pressure conditions within the system and sending signals to the control board to verify safe and proper operation. The assembly helps ensure that airflow and venting requirements are met befo... https://www.partshnc.com/hk06mb011-carrier-pressureswitchassembly-3sw