Any trim gun whether it's 15, 16, 18, or 23 gauge doesn't require much air volume to use. Most of the cheaper hose you see will be 1/4" ID. It will work fine. I use 3/8" in my shop and on my bigger portable compressor. But I operate all kinds of air tools that do require continuous volume. A portable compressor with a 3 gallon tank could be taken into the house and moved from room to room, they're not that big. Up to you.
Mike Hawkins:smile:
Mike Hawkins:smile: