"Do not buy this product! It comes with a rubber seal that doesn't stay in place. When u tighten the waste up the rubber seal pushes up into the waste rather than getting compressed against the bottom of it. I did manage to get it to work after going to a plumbers merchant for a wider washer. The products they had were a much better design. They had a metal locator for the seal to keep it in place and some even have special shaped seals to keep them located. Screwfix you need to replace this item!"