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I want to temporarily seal a toilet drain so that I can fill and soak the bowl with a solution of hydrochloric acid to remove mineral scale. The seal has to be water-tight so that the solution can sit for several hours.

I have tried jamming plastic bags and water balloons into the drain but they don't form water-tight seals.

(I found two products, designed for this purpose, consisting of inflatable rubber bladders, but they are only available in the U.K.)

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  • Quite often design for, can be a name change only. Those products not much more inflatable bladders.
    – crip659
    Apr 21 at 18:28

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I came up with the following hack: I wrapped an air wedge in strips of rubber from a bicycle inner tube like so: Air wedge wrapped in rubber

Jamming and inflating it in the toilet drain as in the following photo, the bowl lost less then a cm of water height over the course of three hours. Air wedge + rubber toilet plug

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