If you haven't, check out this place for tubing, hose fittings and
general run plastics.  You can ponder all the other tubing that is
available.  They do have a lot of info on the products and will
answer questions, along with stuff you never knew you needed.

  http://www.usplastic.com/catalog

Great to deal with.  I'm a long-time very happy customer.

Glen R. Perye Jr.

* Been there, done that!  I am not a lawyer, and never played one on
TV!  All the usual and standard disclaimers apply.  Do not try this
at home, use only as directed.  No warranties express or implied,
for the intended use or suggested uses.  Wear safety glasses.
Closed course, professionals only.