Moisture Trap and Hose Connection Question

let's make it easier... would a Paasche hose fit on the Grex compressor?

If your trying to extend your hose, grex uses standard 1/8" fittings found at hardware stores.  You could use rubber or plastic hose and the fittings at the hardware store to make a hose as long as you need and get the grex to paasche adapter to attach a paasche brush.

You could also get the quick dissconnect for both the grex and paasche, both from grex.  Then you can swap both grex and paasche on the fly on the same hose.

I've seen the airbrush adapter, however, what I am trying to do is attach a grex hose to paasche hose

Yes vertical so the water stays at the bottom of the trap.  Grex makes an adapter to fit a grex hose to a paasche brush.  Grex has several adapters.  Go to grex website and they have them listed.