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Requires the toilet rim to be of a specific shape for the lock to work. see photo
on March 2, 2016
So much for "Will work with most toilets": it didn't work on any of 3 toilets we have (Toto, Kohler, and American Standard).
First of all, this lock requires your toilet bowl rim to be of a specific shape - the outside wall must be straight (i.e. perpendicular to the ground/horizontal surface of the rim). Rims of both Kohler and American Standard toilets we have are slightly angled inwards, so the lock only makes contact with one point at the bottom of the rim (It is supposed to be flush with). See the photo attached. As a result, the mechanism doesn't hold on to it at all.
And Toto's rim was too narrow for this lock - even 4 provided spacers weren't enough to create a tight fit (it is Aqua model I believe).