[Norcoredneck]

I have 3. I used a hole saw and cut(drilled) holes so 3/4" pipe threaded into the holes. I put 2 3/4"X1/2" pipe bushings (black iron not galvanized) into 2 holes. Pipe plugs to close those off. I put 1 3/4" pipe nipple into third hole (black pipe not galvanized) and threaded 3/4" ball valve. My idea is plug 2 holes and use valve, if more air needed remove plug and tune with valve, remove 2 and tune with valve. The other day I had 1 out and valve @ 1/4 open. I welded the bushings and pipe in on mine. Someone could use conduit nuts on the inside if not able to weld. On the pipe bushings more like gooberd, black iron does not take to welding. But they are in there for the long run.






Metal Conduit Fitting Locknuts .