My house was built circa 1935. I'm trying to fit a new bathroom suit but the pipes in the house are a odd size. They're 16mm and 23mm with realy thick walls so the standard 15 & 22 mm connections aren't any use. I've done a bit of plumbing already but am having to file down the pipe and force on a standard fitting. Are there any converter fitments out there. The local plump centre looked at me gone out when I posed them the problem.