This Lochinvar Pressure Switch is a mechanical device designed to monitor the pressure within a system and respond accordingly. The model WH110 & 155 is engineered to activate or deactivate at predetermined pressure levels, ensuring optimal performance and safety of the system it's integrated into. It features a robust construction that can withstand high-pressure environments, making it suitable for various industrial applications. The switch operates by converting the pressure into a mechanical movement, which then triggers an electrical signal to control other devices or systems. This particular model is compatible with specific Lochinvar units, offering seamless integration and reliable operation.