Hi Wayne, Go ahead and use PEX, I have always used the Wirsbo Brand...there are as many brands as there are Chinese manufactures of everything else plus there are quality brands, and everything in between just as everything in life...you get what you pay for.
No team has ever come back from a 3-0 deficit in a playoff series. The 1951 New York Knickerbockers, the 1994 Denver Nuggets, and the 2003 Portland Trailblazers came back from a 3-0 deficit to tie the series at 3-3, but neither won their respective Game 7. Eight teams, however, have rallied back from a 3-1 deficit.
There's a reason that dating back to 1990 only 12 percent (23 of 204) of the teams which have started 0-2 have gone on to make the playoffs (via ESPN). If you're 0-2 now you likely have to go at least 10-4 the rest of the way. That's hard to do.