Originally Posted By: bking
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I have PEX with hot water recirculation pump and check valves in my home and was installing the expansion tank that the plumber left out…
I needed to reuse a 90 deg fitting so I cut the copper crimp rings off and tried to pull the pipe off, no luck without cutting the pipe.
The fittings have barbs that get smashed into the pipe which in effect will keep the connection intact even if the crimp breaks, up to normal pressures and probably more.
I wonder if there are fittings out there without the barbs ?
If anyone has PEX connection problems they should see if the barbs are present.
I see no way for a properly installed PEX crimp connection to fail, ever.
The compression fittings? Now that might be for someone else to comment on.