If there is any rationale for the design of this product, it eludes me. The block is made of rigid, inflexible plastic. Therefore it is not possible for it to fit the outlet of a specific toilet. If the toilet outlet isn't a perfect circle (which I've never seen in real life), then that block isn't airtight. And if it's not tight and you try to blow air or water into the toilet, the likely result is that the toilet's contents will slam back into the user. Not a very pleasant prospect. If the device were made of flexible rubber instead of hard plastic, I see the approach to this design might be worth considering. And since it is, I'm outraged that I have to give it a star. This is one of my biggest buying mistakes.
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