The Xylem–McDonnell & Miller 347900-SA150-106R Bellows Assembly is a precision-engineered component designed for use in boiler control and HVAC systems. It functions as a pressure-sensitive element that responds to fluid level or pressure changes, activating switches to maintain safe and efficient system operation. Commonly used in low-water cut-off and pressure control devices, this ... https://www.partshnc.com/347900-xylem-mcdonnell-miller-sa150-106rbellows-assy