Yellow PE pipe is the preferred method, but DIY'ers are not supposed to be able to purchase it.
I don't understand how the gas company anywhere can allow uncertified installers to install gas pipe underground outside. The federal law is murky, but I guess service lines are up to the house. They should have said underground gas lines.
It seems like most manufactures of the new methods of gas pipping say their product requires certification to install, that makes code officials require it and probably saves the manufactures some troubles from DIYers messing up their product and giving them a bad name. Do you like the Normac?
This is awkward, but...
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