The Burnham 104604-01 Differential Pressure Switch is a precision control component designed to monitor pressure differences within HVAC boiler systems. It operates by detecting differential air or gas pressure and activating or interrupting an electrical circuit when the preset pressure threshold is reached, helping ensure safe and reliable equipment operation. Commonly used in Burnh... https://www.partshnc.com/104604-01-burnham-boiler-diff-swt117wc