This Lochinvar Pressure Switch is a mechanical device designed to monitor the vacuum pressure within a system. It operates by responding to changes in pressure and activating an internal switch at a specific threshold, commonly referred to as the set point. The switch is typically used in heating, ventilation, and air conditioning (HVAC) systems to ensure that the system is operating within safe parameters. The Lochinvar model features a durable construction and is designed for reliable, long-term use. It has been engineered for precision and accuracy, ensuring that it responds correctly to changes in vacuum pressure. This pressure switch is an essential component in maintaining the safety and efficiency of HVAC systems.