Date:   Sun, 17 Jun 2012 17:01:11 -0400

Would this work :

http://www.watts.com/pages/_products_details.asp?pid=6761

Two hundred degree maximum operating.

One might be able to eliminate a few rubber hoses by clamping directly to distribution nipples.
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Hi Ken,

The 200�F rating is probably for a max continuous temperature...
Meaning, a spike in coolant temperature to 220�F for awhile will not mystically melt the PEX..

What will destroy PEX Tubing are UV rays....
Would require a UV protective wrapping/cover...
Reading the building code specifications for PEX: even short exposure to UV Rays from sunlight
on a job-site are to be avoided. 

Given PEX's marginal temperature rating and zero tolerance for UV rays, not a good alternative to
the aging PVC of the OEM plastic pipes... 

Good hunting...

Pz
on a rock off the West-Coast of Cannuckistan