PVC to copper coupler wont seal

Guys, I've replaced the "gator bite" coupler that connects my plastic line to the copper line going into my house about 3 times. It always drips on the copper side. Looking at the pic, I know you see some bends in the copper line, but the last two inches that go into the couple is straight, and I filed down the burrs on the end. The first time I used glue, but was told not to do that, so I didn't use any the last time. So what can I do to get a seal on that copper side?? Is there some kind of sealant tape or anything I could use?

Chances are that the end of the copper tubing is not perfectly round.
I would sweat on a short piece of hard copper or a CPVC transition fitting.

Wow...

No, glue, no tape, no sealant.

You need clean straight copper for this to work and you're not providing that...

dlarrivee said:

Wow...

No, glue, no tape, no sealant.

You need clean straight copper for this to work and you're not providing that...

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I did provide all of that this last time. No glue, tape, sealant. I cleaned the pipe with an alcohol prep, let it dry good and wiped it down. And I still have a slow drip.

Using a sharkbite style fitting on soft copper is not a good choice.
Copper tubing comes in rolls, and the process of rolling and unrolling it results in a tube that is no longer perfectly round.

So true.
Soldering with no lead solder and a fitting takes care of the out of the round pipe.
Added by Terry

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Just like cacher said, soft copper, no matter how careful you are with it, will never be perfectly round. Even if it's just ever so slighty "egged" you won't get a proper seal on that sharkbite. Soldering would fill the gap or if you don't have the soldering tools you could use a brass compression fitting. Even if you manage to get the leak stopped with that fitting, it's just a matter of time before it starts to leak again due to expansion and contraction of the copper and the plastic.

The biggest problem with that piece of tubing appears to be that it is "pitted", and if so THAT is why it does not seal. I have used Sharkbites on soft copper many times without leaks.

Herr Inspektor makes a good point. There is a copper-to-cpvc union that claims to handle that difference in expansion. I don't know if it is listed for direct burial.