Filling question?

From your post it is not clear what you want and what you have. Are you trying to make the fill assembly yourself? Are you expecting to buy components for each function and assemble? It sounds like you may be in a bind because you have everything already, but no bleed capacity. If I’m reading this right, you can make your bleed valve, it is not difficult to do. Most of the fittings have reasonably large passages on the inside, so they can flow more air. This is not important for us airgunners, as any air left inside these passages gets wasted. So the smaller the better, for us. And the shorter the better, for the same reason.

If you have a manifold with enough metal (beefy enough), you can drill and tap a small hole down into the air gallery. Use the tiniest drill you have. Then drill down bigger with your tap drill size, but not all the way; go down 3/4 of the way, then tap with a bottoming tap. Go to Home Depot or Ace Hardware and find a steel ball bearing which will just fit when dropped into your tapped hole. This will act as your seal on the bottom of your hole. Then all you need is a knurled bolt (I use an allen bolt as it is already round, then just put more aggressive knurling on it) to put into your tapped hole and you are done. Do not use a very large hole for your tap, select a medium/small bolt size as larger circumferences are harder to seal and more inaccurate due to possible chatter from your drill bit.
Optional: you can also drill a very tiny hole from the side, into the space where your ball sits (but above the seat plane,i.e., stay above the very bottom of threaded hole) to act as a gallery for the bleeding air to rush out from. This is optional as I have built them both ways. The air will just normally bleed around the bolt threads and this works too, but you can bleed faster with a dedicated gallery and avoid some of the binding caused by air trying to flow around your threads.
Needless to say, be sure all your swarf and chips are cleaned out before pressurizing. DO NOT have any solvent in there when you pressurize, either. Blow it out clean with compressed air or let dry for an hour before using if you have used a solvent.

The only safety concern if whether you have enough thread height to hold back the bolt when you close the valve. For that to happen, you must drill into an actual manifold, not a tubing piece or fitting. I like to use the manifold that the other pieces are mounted in, like the pressure guage.

aloha,
walt

Try this guy…He is an HPA genius….
Jim Shelden
jlshelden@sbcglobal.net
316-992-0505