Looking for a replacement solenoid?
I came across this item on that evil site we don't mention?
If you have a funky solenoid or need one, this item is of the type I like to use. It has the correct connections for soldering or using quik-connects to attach the wires, uses 12VDC and is pictured with brass 10-32 fittings already in place. I would definitely check that those fittings are part of the sale but it would make it easy to have them already. One would need to replace the top fitting that comes out of the exhaust and use a 10-32 screw to seal that but it would be slick to just cut out your funky old solenoid and add this inline in your tubing.
CLIPPARD ETO-3-12 ELECTRONIC PNEUMATIC VALVE 3-WAY SOLENOID VALVE 12 VDC
And before you wonder, no, It is not my ad!! Just a thought as I have no skin in the game either way.