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I have a few questions concerning pex tubing. I want to install under floor pex in my bathroom. I know I need an oxengen barrier pex. Should I stick with Wirsbo? I read about Safelink as a good product. Does it compare to Wirsbo? Also, am I correct in assuming when you speak of 1/2" pex, you are referring to OD? My last question is, once I figure my heat loss for the room, how do I apply it to the size and amount of pex to be installed. Thanks in advance to any replys.