Yes. The back air line is active air pressure. It's a needle valve which is letting a small amount of air fill. About one shot a second.The small pipe is just so I can hook up compressor air.

Thank you got it working with a few mods. The needle valve slowly let's air fill the chambers but still allows quick discharge.

Any design mods to help a newbie? This is my first one.

Need some help to make this qev work. What's wrong with my.setup?