I've just bought a mixer tap for the kitchen and it has flexible pipe inserts that should connect up to the other end of a compression joint. However they are different sizes. I think that the tap wants to connect to a 15mm compression joint and the compression joint already fitted my be 17mm ( or might be something imperial?? I just know that it shrinks looking at the old pipework :? ). Anyone know of a flexble adaptor pipe or something similar. Soldering is way beyond my skills.