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I could be wrong ... but it seems like the specific UV light resistant of the specific PEX tubing could be a factor. I have memories of some tubing becoming cracker-crumbly brittle in the past.
Any tubing should work as long as it's rated for the pressure you're using it for, and it's protected from any sunlight, or it specifies UV resistance. Most black tubing will resist UV.
I use Nylon N11 from Freelin-Wade. 1/4" is rated at 600 PSI (2400 burst), 3/8" is rated to 250 working pressures. They have a high-pressure N11, 800 PSI working pressure for 3/8".
Any tubing should work as long as it's rated for the pressure you're using it for, and it's protected from any sunlight, or it specifies UV resistance. Most black tubing will resist UV.
I use Nylon N11 from Freelin-Wade. 1/4" is rated at 600 PSI (2400 burst), 3/8" is rated to 250 working pressures. They have a high-pressure N11, 800 PSI working pressure for 3/8".
I've been getting the 3/8" Freelin-Wade through Burns Controls for 43¢/ft. The shipping is really high, but it's still under 50¢/ft. total. You may have to contact Freelin-Wade to find your closest distributor.