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.
Exactly how tough is rather stunning. Going back to the 2005-06 season (excluding last season, of course) 32 teams have found themselves at least four points out of a playoff spot on Nov. 1. Out of that bunch only three -- three! -- were able to overcome the hole (stat via Elliotte Friedman).