Hi, I have one of these and my b/f used some kind of gas pipe attachments to add to my compressor and I now have 4 airbrushes attached to it. I only ever use one at a time, but it's so handy having the colours to hand and not having to flush after each colour change. Not sure if this is what you meant or if you want to be able to use more than one at the same time - I would imagine the pressure would drop considerably. For the 'bits and pieces' needed we went to a Plumbers supply shop and it cost just over £10 for everything we needed.
Jackie