Modine 5H78034-10 Vacuum Pressure Switch is a control and safety component designed to monitor pressure conditions in compatible Modine HVAC equipment. It operates by sensing changes in vacuum or pressure within the system and switching the electrical circuit when the specified pressure level is reached. Commonly used in Modine heating systems, including gas-fired unit heaters and rel... https://www.partshnc.com/5h78034-10-modine-vacuum-pressure-switch-tlp