From the Manufacturer

The Safety 1st Sure Fit Toilet Lock has been updated and improved for a better fit in today’s bathrooms. This design utilizes suction cups and is positioned on the toilet tank behind the lid. It does not come into contact with the bowl and is easy to remove and clean. The Toilet Lock is easy for a parent to operate while difficult for the child. This features a spring back mechanism so the lock automatically slides back in place after the lid is shut.

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