It is not a real fix in the long run. The toilet's cylinder and its mating surfaces need to be more effective. My old toilet had a better system. I thought saving water by a more forceful small amount was an improvement. This is not working like my old toilet. It never leaked and filled up at times on its own. The toilet needs a new design. Over all it flushes perfectly. It just leaks in due time no matter which seal is used. The neoprene is the best. The toilet design for that cylinder to sit on needs rethinking.