The Trane SWT04798 SPDT Pressure Switch is a pressure-sensitive control component designed for compatible Trane HVAC equipment. It monitors pressure changes and uses a single-pole, double-throw (SPDT) contact mechanism to switch electrical circuits when the specified pressure threshold is reached. This helps regulate equipment operation and supports pressure-related control functions ... https://www.partshnc.com/trane-swt04798-spdt-pressure-switch