House Plumbing - water leak

[Keith Seymore]

Gentlemen -

I'm on about my 4th or 5th iteration trying to fix this plumbing leak.

The situation is related to an outside hose bib; there's a section of black flexible pipe, which transitions to a white plastic push in fitting, then to the copper.

It's leaking right at the black pipe/push in fitting. First thing I noticed was the old hose clamp was rusty and nasty, so I cut it off and replaced it with a new clamp and torqued it down. No good.

Next up - let's try TWO hose clamps, right? No good.

So - somewhere in there I decided to try the copper colored permatex RTV and let it set up overnight (24 hours) - still no good.

What's the professional way to fix this? Do I need heat to soften up the black plastic?