Can anyone tell me if these connectors meet code? How effective are they? Could I replace old copper lines using these connectors?

I bought gator bite solderless connectors there is a white plastic flanged piece In package. What is it for, nothing about it in instructions.

I purchased some GATOR BITE fittings which have plastic inserts. Sales person told me that if using copper tubing, not to use inserts. I also purchased some SHARK BITE fittings which have plastic inserts. Sales person who sold me the SHARK BITE fittings said the inserts must be used. Does...

Tom, Great advice I have been reading your responses and amazed with your plumbing experience! My question is that I used a 1/2 pex/sharkbite fitting to come off the copper supplies for a new shower, how do you feel about pex/sharkbite fittings? Its been in for about 8 months now, no problems.

How do I fix leaking water around gator bites on copper pipe?