Barry, I got a couple of those pipe fittings that have a rubber sleeve and nut on top. You slip them into the pipe and turn the nut to expand the rubber against the inside of the pipe. I adapted that fitting with brass fittings to adapt to an air hose. One has a tire valve stem on top and I use a inflator to blow out obstructions. Another I have adapted a male quick couple on. Just plug the hose into that one. I only use it for blowing out the pipeline to winterize it, as I can open valves on the various runs to get each blowed out.
