Product review (2 stars): Very poor functionality
Those things called guards or stoppers. I think whoever designed them forgot about another functionality that is required: it is not supposed to be a guard and/or stopper both ways. It only has to prevent water and stuff to splash from disposer, but it is perfectly ok and even a must to let water to go the other way - which is obviously not the case with this thing. I was trying to cut different parts of it several times to let water go through, it a little bit got improved but still not even close to the original Waste King splash guard, which BTW simply did not want to 'sit' in place and therefore required a replacement. I'm still not sure whether it was worth it to get such a bad substitute.