[lbrachfe]

If thee solenoid is continually exhausting from the port then unscrew the black ring and take the unit apart and clean any buildup around the interior spring and then rebuild. Takes only a few minutes. This may or may not be the fix. you made need to just replace it. These are all over the bus and are very easy peasy to replace. all the unit information is printed right on the plastic case. Most come from Spartan Scientific..