"After cleaning out bottle trap under kitchen sink it was leaking. Seal looked worn. Tried unsuccessfully to buy replacement in three local plumbers merchants, only went into Screwfix on the off chance they would have one and was surprized they did. Saved me having to replace the bottle trap which would have been a difficult job as it did not have screw fittings but was cemented to the waste pipe. Saved me a lot of time. Well done!"