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Sharkbites are compatible with both pex and copper. Push the sharkbite fitting on the copper until it locks and push the pex on the other end. I use sharkbites whenever possible, there is even a little tool you can buy to take the fittings apart, that fitting can be reused. Sure cuts down on plumbing time.
Mel
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Yes, just shove it in. Just clean and debut the end of it will cut the o ring. Make sure it's seated all the way or you'll be back. Only had one problem with shark bite, and it was on top of a water heater where water hammer allowed the pipe to move every time the water was turned on and off. It wore the o ring out eventually.
In general, I always try to use solder or per wherever I can, but shark bites are great for repairs in tight spots. Just used one in a rental house under a sink where I could barely reach.
Mike
Non impediti ratione cogitationis
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I find it's best to mark the pipe 1" from the end to insure it is fully seated in the fitting. Working in a tight spot, it can be hard to tell if you got it. Push the pipe in to the mark and your good.
I use them all the time for repairs. For new construction I would solder copper or crimp Pex.
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I personally would not use sharkbites as a permanent fix in an inaccessible location.
I am not convinced the O-rings will not deteriorate over time. They use an EPDM O-rings, which are superior to your garden variety of rubber, but is still subject to environmental degradation, but to what degree, I'm unsure. Its a good material for the application, but is not permanent.
Definitely do not expose the O-rings to solvents or aromatic hydrocarbons. In other words, don't lubricate them with common greases or Vaseline.
I just wonder why you would add a seal to a system that otherwise probably has infinite life if done in copper or pex.
I keep several sharkbites in my plumbing kit for field expedient repairs and they are the bees knees in that situation.
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