You Can but typically the pipe for the shower head that is coming out of the wall is just a short piece of pipe that you should be able to remove easily enough by unscrewing it. Then you can just replace that piece with a new one. == Answer== Do the same as above but make sure your shower arm is not floppy, if it is you could tear up the riser coming to the arm. Be very carefull.
You need at least a 3 in. pipe -- shower is 2 in. pipe
2"
Absolutely NOT you 2" minimum
Look at where the cold air is coming from and see if it can be stopped, if not insulate the pipe.
There is slight blockage in the pipe probably further down, the pipe needs a good cleaning througout the length of the pipe, preferably with a wire/brush type cleaner, checmical cleaners or drain type cleaners may be too weak to clean it due to the length of the pipe.
Shower pipe is gray
You need at least a 3 in. pipe -- shower is 2 in. pipe
2"
Water won't drain from shower. Either trap or shower drain line is clogged.
Normally 2"
No. Australian pipe threads are metric and the US is not.
Take the shower head off the pipe coming out of the wall and look in it. There will probably be a disk in it with about a 1/8 inch hole in the middle. That's the flow restritor. It should pop out or some screw out.
I am assuming you are talking about the curved pipe coming out of the wall leading to your shower head. In order to change it, simply unscrew it counter-clockwise using a pipe wrench. To install the new one, make sure you use pipe sealing compound and wrap the jaws of the pipe wrench with tape to prevent the finish from marring.
the shower and bath water comes from two different places so their is two different pipes. Get the shower pipe checked out by a plummer and they cause fix the pipe.
A poor plumbing job. The pipes to the shower & sink share a pipe to the water heater and the pipe is not large enough. This causes the water pressure in the pipe to drop when the hot water is turned on at the sink while the shower is also on.
This question is vague as it doesn't state where exactly between the main and shower head it has broken. However, worse case scenario, the wall will have to be excavated a little to allow for the pipe to be replaced, using the required fittings to go with it.
Shower drain goes into a trap under shower. Continue piping from trap to drain line.