These shark bites are expensive relative to the pex bands and there are reported cases of failure (read that leaks) if not installed properly or (possibly) due to vibration. You can replicate the method that was used at the factory - pex bands - that are tightened with a special tool that can be a bit expensive or you can use 'shark bite' style fittings that are simply Pushed onto the pex and/or fittings. Basically there are two methods of doing this. The most difficult part of this whole process is 'clamping' these new pieces of pex pipe and fittings into place. When you cut the old valve out it is more than likely that you will need to add in a short piece of new pex anyway unless there is enough slack in the existing line(s) so that you can simply put in the new valve. To move the valves all you have to do is add in a pex connector/union to the existing piece(s) of pex, run additional pex to where you wish the valve to be located and then insert the new valve. Both jobs require that you cut out the damaged valves. If you intend to do the replacement of the valves yourself then it really wouldn't be any more difficult to move those valves.
