We're removing - or trying to remove - an old cheap plastic shower stall which our house's previous occupants installed in the downstairs bathroom. Three of the thin plastic walls came out with a little puffin' pantin' and cussin', but the last wall, the one in which the water valves reside, has got me totally stumped. The valve seats look to me like they're made of plastic but on the outside, there are copper pipes going into them, which look like they've been soldered on. There are plastic wing nuts on the outside where the copper pipes go in, but I cannot budge them (I broke off one of the wings; I think they just hold the plastic valve seats in place).
What to do? How do I handle this? Is this a torch and solder job?