The special bowl shape of a toilet requires a special plunger shape. And that shape is reflected in the flange plunger or a similar one called a ball plunger. Both these plungers have a specially shaped bottom designed to seal the opening in the bottom of a toilet bowl and maintain the required vacuum and pressure during the plunging action.
How to Unclog a Toilet Fixture
By Bob Formisano, About.com Guide
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