how easy is it to fit adouble water valve on a wma48p?

If it's leaking from the valve body, then it won't repair.
Just check to make sure the leak is not coming from the small internal hose /connections. Fitting a replacement is easy. Make a note of which spade terminal goes to which spade. Apair of pliers and a Philips screwdriver should do the trick

Cledlyn
February 2009