By the color
The base metal is iron - the active metal is zinc (galvanized)
Metal LENOX
GI Pipe is "Galvanized Iron" Pipe. These days the pipe will likely be made from steel rather than iron.
without touching it? no what you will have to do is sand or scrape the pipe then you will be able to tell the difference. if its a dull metal then its black iron but if it shines then it would be galvanized.
Yes.
Yes, the kind you use for duct work.
Galvanized pipe will be silver/gray color. Copper will be copper. Use a magnet, it'll stick to galvanized pipe but not to copper. Drinking water lines should not be black steel pipe.
ya the galvanized pipecan be use in undergrounds,,, because it is an iron pipe
It is a metal pipe that was used before PVC and cpvc. I hate it, it know from closing shut whicjlh in turn well cause little to no water pressure. If ya go it, get it replaced. If you don't you'll be taking drip drop showers. <><><> Steel pipe coated with zinc metal (that is the galvinized part) which delays rusting.
Galvanized Iron pipe
Yes
Depends on local codes I use Galvanized piping and fitting when I know the piping is going to be exposed to moisture (dampness) or the elements