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Ok, I did tell you the entire plan. The original sink was at the corner of that room so the trap was far from the vent. I want to move the sink to the middle of that room where will be very close to the vent. the distance from the trap to the vent will be cut off at least half, say 1' or 2' from the vent.
I will get rid of all existing electrical on that wall.
I will tear off the wall today, i think there will be nothing except for the hot and cold pipes.
Thank you for your help and I know i can hide it into the wall properly now. But I want to contiue this topic.
The long arm shown on the photo is not really that long. It's less than 5'.
It looks like the vent pipe is galvanized steel pipe. I know have to handle copper and cast iron pipes but don't know how to deal with galvanized pipe. It will be similar as how to handle cast iron? The difference is galvanized pipe can use thread connection but cast iron cannot?
The easiest way to change that pipe is to cut it above the threads on both ends with a reciprocating saw, just far enough to get half of a flexible coupling (Fernco) on it. Then you can easily install PVC to reconnect the vent. This works out much easier than trying to loosen fittings that have been in for 50 years.
Distractions are everywhere, don't lose sight of your dream.
Where I live needs to use same material to replace/repair the vertical pipes. So I have to use galvanized pipe
If you give us more information we could probably help you with Code issues. Of all of the major International Plumbing Codes (not to be confused with IPC) I am familiar with non of them say you have to stick with galvanize if that's what you have.
"Somewhere a Village is Missing Twelve Idiots!" - Casey Anthony