Ron, I expect PEX would be OK but the working pressure recommendations at higher temps concerned me a bit. In all likelyhood, working pressures listed might be several times less than failure pressure, so I should not have worried about it.

As it is, I did a bad and dangerous thing anyways; by mixing differing brands of hose, fittings, and crimper. If you happen to look out to the west and see a mushroom cloud coming from my direction, you'll know the hose, end, & crimper suppliers were right and I was wrong.