[Richard]

So a couple of inputs;

I respectfully disagree that you do not need to use DOT fittings. We live in a litigious society. I personally don’t think it’s worth the additional cost of a DOT fitting over a standard plumbing fitting to protect yourself against a litigants attorney finding a non DOT fitting anywhere in the air system that feeds the braking system. Yeah, I know, an argument can be made that anything on the other side of the PPV doesn’t require DOT. This is MY opinion.

A word of caution about using a shutoff valve on the generator air cylinder. That is a double acting cylinder, meaning it requires air pressure to hold it open AND closed. When a shutoff valve is used, no air is holding the cylinder closed, and only the very light weight safety catch is keeping the generator from sliding out the front in a hard braking event. The whole pneumatic cylinders are hard to come by statement is flooey. Seals are readily available for rebuilding pneumatic and hydraulic cylinders if you can use a micrometer to measure the old ones, and McMaster Carr catalog.