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File description: Radiant Heat Tubes Your name: (optional) Mark V.S.
File: Click here to d/l...
When I did a search for this technology recently, I found that the generic name for the plastic tubing is PEX (meaning cross-linked polyethylene, or Poly Ethylene X-linked).
Here is a very good article on the subject:
http://www.taunton.com/finehomebuilding/pages/h00028.asp