Originally Posted by jocco
The current valve is soldered into the pipes so I would need to hire a professional to replace it.
Soldering copper pipe is a DIY sort of job... but it is something that takes a little bit of practice to get it right.
Practice parts are cheap (piece of copper tubing and some cheap fittings), about $20.
But the basic tools can quicly cost you around $75 (depending upon how much you spend on a torch... mine was $30 because it has a push button igniter).
Perhaps the most difficlt part of the job will depend upon how the existing pipe is oriented and mounted. Copper pipe doesn't bend, so you have to either have room for the pipes to seperate when you either cut the pipe or unsolder a connection.