DERPIPE Plumbing Pipe Connector,copper series.
These product certified to NSF ANSI 61 lead free brass,which is environmental, safe.
These products easiest plumbing fitting to join any combination of Copper, PEX, CPVC ...pipe together.
You just need to push the pipe into the interface.
Once inserted, the stainless steel teeth bit down and grip the pipe.With no, clamps, unions required,