GWguy
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I don't like the fact that the sharkbites allow the pipe to rotate. Someone new to them has to realize to clean the pipe and debur the pipe well or they will leak, you also can't use them over a pipe that has had a compression fitting on it in that location.
The rotating is great when you're installing an elbow or something, makes lining up the pipes a breeze. Not so great when you have a valve. When you twist the valve, the damn thing rotates on the pipe.