The most professional install of PEX plumbing I have seen on the Internet. Note the clips as the PEX passes thru to footer and bracing with clips part way up. Then there is the equidistant spacing between the lines. True craftsmanship even considering no one will see the work when the walls are closed up.
For water lines, there are three grades: PEX-A, PEX-B and PEX-C. They’re manufactured differently, PEX-A being slightly more flexible. If you’re ordering online, go ahead and spend a few cents extra for PEX-A. But don’t go running around town looking for it; the difference isn’t that big. The plumbers we talked to would be willing to use any of the three types in their own homes. PEX is also popular for in-floor radiant heating systems, for which you need PEX tubing with an oxygen barrier.