I have to join 1/2 inch copper to 1/2 inch cpvc and the
'clerk/salesperson' at Home Depot sold me on using the Push N Turn
couplings. Well I've now used up 3 of them (they're non reusable
items)and I still have a leak on the cpvc side ! The copper side seems
fine. It's become a waste of money and time. Is this 'do-able'and am I
missing a trick?