: I am installing a gas furnace in my garage. After a little research and math I figured I have to run a 3/4 inch gas line,underground. Im getting conflicting info.about the materials that should be used.I thought It had to be black pipe but I was told copper can be used. I also heard about a flexible plastic/metal that can be used. What would best for this job? If black pipe, does it need to be coated with anything? It Is about a 70 foot run from the meter to the garage, with 3 or 4 turns. Thanks, Scott
The materials required would be specified by the local plumbing inspector. Generally, a job as this would be filed, inspected and approved by the gas supply co. & the plumbing department.
Good Luck. e-plumber