In article , "BigBen" wrote:
Need to hook up a natural gas fire log inside my fireplace. It says to not
use regular copper tubing but 'Internally tinned copper tubing'.

What is this stuff and how can you tell if you have it? Is there a marking
on it that says its tinned?

What, you can't tell by looking?

If it's tinned, it'll be tin-colored (similar to stainless steel). If it's not
tinned, it'll look like copper.