Again, Rudy, what happens if somehow you had a rodent chewed through the
PEX?

What if an asteroid crashed thru the roof and hit the pipe ?

And how long does PEX last?

The Wirsbo PEX is cross-linked polyethylene with an oxygen infusion barrier.
It has been used in Europe for 30 years, with more than 4 billion feet of
installed tubing performing without a single incidence of product failure.
500 million feet of that is in North America alone. Samples of the tubing
have been under high temperature and pressure continuously since 1973, with
no sign of decreased performance. Tests, both by Wirsbo and independent
sources, predict that the Wirsbo PEX tubing should have a system life in
excess of 100 years

And what of water pressure? Is there any chance it could rupture under too
much pressure?

Wirsbo PEX tubing currently holds the unofficial world record for long-term
testing at elevated temperature and pressure -- 26 years at 203° F at 151
psi, and still going. When the test is completed, the record will be
official.

And what of attic installation? If it gets 105 in the desert, the attic of
a house
could really bake. Could it not exceed the 200 degrees?

No..our house was in the Sonoran desert where the OAT EXCEEDED 105 oF. The
PEX was plumbed thru the attic spaces. No problems after 8 1/2 years and
BTW, see above, Home plumbing is NEVER anywhere near 150 PSI..more like 70
# or less.