I really should not post this and reveal my ignorance. but. I was trying to do a nice neat job above the water heater and made a expansion connection too close to a ball valve. I got the propex tool hung, ruined my pex cutter trying to cut the fitting off and did not know it but I cracked one of the expansion jaws. I made about five more connections and it broke off. I had to finish with sharkbites and cinch clamps. and two trips to Home Depot.
Oh, and I ruined a $20.00 wirsbo ball valve. The little accident will cost me about $80.00.
My son in law the plumber told me they tell you about that in the training you are supposed to take before installing wirsbo...
Thougt I would share, just in case it might help.