Gas line

[RobertSmith]

Is CTS allowed to be buried/exterior usage?

[David Bell]

I don't believe that the underground piping is csst, looks more like a reinforced vinal tubing with a mechanically pressed fitting that attaches to the regulator. There are direct burial csst options that also have lightning protection.

[Scott Patterson]

That also looks like it is for LPG and not natural gas. LPG installs in many areas of the country tend to not follow the same guidelines as natural gas installs.