Cross-linked Polyethylene ("PEX") is now the industry standard for
rv/trailer plumbing... i seem to recall that Airstream Dreams carried the
tools and fittings at one time, but a quick check of their website shows
that to be untrue.
http://www.flair-it.com/ is the website to get the skinny on the stuff you
need, and what you can do with it...
the Trailwind will (someday) get a complete PEX system, with manifolds and
bypasses etc. to simplify r&r of components, and winterizing, etc... it
really is the way to go.
tuna
reno, nv