Yes, there must always be a watertight seal—specifically a wax ring (or rubber/foam gasket alternative)—installed at the bottom of the toilet. This crucial seal is compressed between the underside of the porcelain toilet bowl outlet (the horn) and the metal or plastic toilet flange anchored to the subfloor. It prevents wastewater and sewer gases from leaking out onto your bathroom floor every time the toilet is flushed. Verification: Inspect the connection point between the bottom porcelain bowl and the floor during installation to ensure the wax ring compresses evenly.
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