I'm a GC in Florida, I've worked quite a bit with PEX. Not sure I understand what you mean that the coupling is going to be burred, the standard PEX couplings are barbed or "ribbed" if you will. The PEX tubing needs to be cut square, put your crimp ring on the tube and insert the coupling into the tube. Crimp the ring using the crimp tool, there is not any coating or protective sleeve that needs to be over the ring. These tings should not be used under concrete or buried in the dirt. Typically the connections are in a wall cavity, attic, cabinet or some other semi-protected space. Hopefully this helps.