Vacuum Solenoid Regulator
This component supplies the vacuum signal to the feedback carburetor. A solenoid and regulator are enclosed in one housing. When the solenoid portion is de-energized, the output port is blocked, and vacuum is dumped to the atmosphere. When the solenoid is energized, the lower output port is open (atmosphere vent blocked) and vacuum is applied to the carburetor auxiliary fuel metering system.