The sturdy three-way switches used in the Airzone solenoid panel connect to the vacuum and pressure side of the, pump while the common port connects to the field damper tubing.
Normally open or normally closed operation is field-selectable by reversing the tubing connections. Each SOL can inflate one or more Flexdampers. ALL Flexdampers tied to a solenoid will open and close simultaneously.
Specs: 24V operated at about .33 amps. 4.5"x2.5'" x 3"
Used as replacement or expansion.