Existing PVC underground gas lines

Anyone aware of listed fittings to repair an existing PVC gas line? I have a situation where long runs of existing PVC pipe are installed under hardscape.They want to replace the existing metalic risers but not the PVC. This is a large existing residential complex.
They say the risers are old and rusting out and need to be replaced.They want to use a short section of PE undergound with metalic risers and new mechanical fittings to transition from the new PE to existing PVC. I'm not comfortable with approving this repair as the fittings are not listed for PVC. Any comments are appreciated.
Original Post
The basic piping materials are not compatible for glue joiniing and unless the mechanical type fittings are listed for the gas underground use, you have a problem. Try to find a transition assembly that has the proper materials on each end before the connection to the metal riser.
Thank you Jim.

During some research, I did find a transition fitting from PE to PVC.The manufacture's info calls it a gas transition fitting, and includes some relevant standards,however I'm not sure if it is actually listed. Also you would still have to make a connection from the existing PCV to the transition fitting.

If I find something listed for this I will share,but I think their only choice is to replace the entire line if they need to make a repair.

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