Brake it down
Well you will have to determine why it is leaking. It is just a loose fitting? try tightening it up with a wrench Is there a crack? Is the pipe white PVC (plastic) or copper or even gray metal? If it is any of these you will need to cut it out and replace that section. You might want to consider hiring a plumber.
Dig it up and replace the leaking section.
If it is leaking when you use the shower, not shutting off completely, it will need to be replaced. If it is leaking at the wall, take it off and reseal the thread on the pipe with either pipe dope or Teflon tape and reinstall.
If it's a green corroded pipe then it's old copper. -You can't fix it. Replace all the length of corroded pipe with PEX and a union at each end
NO!!! It will need to be cut out and replaced to solve the problem
You pretty much have to open up the wall. If you had access to the ends above and below the wall I suppose you could cut the pipe and put a 3 inch pvc inside of it if there were no branches in the pipe, but that isn't likely. There just isn't any way of fixing it without opening the wall.
pvc flange if glued properly can not be detached you just need to cut it and fix up a new one if the old flange is useless. www.pvcpipe.in
More information needed. Is it visible, is it underground, is is plastic, is it metal pipe - -
I was in the PVC pipe manufacturing business for over 30 years and have never heard of a "1K PVC" pipe. If "1K" means a 1,000 psi pipe, this does not exist as a commercial product. Sorry.
An instrument made of PVC pipe.
A pipe cutter is the best tool to cut PVC pipe.