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fosta-pex v pex al pex: fittings and prep?
I'm about to repipe a house we went early to pex with crimp rings and brass fittings that are slowly degrading and leaking (15 or so years in service, relatively clean but acid water with no chemical treatment). Seeing degradation on both cold and hot water. Seems random. Some fittings look like the day they went in and others have started small leaks and look horrible. Doesn't seem to be related to flex off the fitting or any other configuration issue.
So since we piped this house, we had another house where a squirrel bit through a pex line, and since I'm trying to not have to repipe this house for the 4th time in my life, thought I might try to hedge my bets with a pex-al-pex or pex-al-pe system. mildly more squirrel resistant, although if they nibble off the PE and piss on the pipe maybe the aluminum will corrode but if i'm being given reliable infor by tech types the inner pex layer is itself more or less up to the task in the minor areas that might be so affected.
As best I can tell, once prepped with the chamfer tool (which Viega techs imply peels both the PE and aluminum layer just far enough back for stainless crimp sleeve), Viega specs the same pex press fittings that are used on plain pex. Not 100% clear however that the prep and fitting spec for other, e.g. Uponor/Wirsbo and Bluefin pex-al-pex systems is the same. But not clear that it is not.
The Uponor/Wirsbo multi-press fittings look pretty similar to viega. Assume they use the same prep tool or a prep tool aimed at the same result and the same press tool? To my knowledge there is not a go/no go gauge for the pex press (trade name is pureflow, i believe) standard which is a minor weakness or maybe it can tolerate a broader range of results, or is inherently more accurate in the tooling, but i would think there still could be a go / no go specification. . . .
And then in the NFN department, no one seems to concede, but i believe the prepped Pex-Al-Pex or Pex-Al-PE is suited to F1807 or F2159 connection which follows from Viega saying to use standard pex press fittings which conform to those standards in my understanding.
perplexed in Exeter