If a tank leaks water into the bowl, the most probable cause is the

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Study for the NOCTI Plumbing Test. Prepare with flashcards and multiple choice questions, each question comes with hints and explanations. Ensure your success on the exam!

Multiple Choice

If a tank leaks water into the bowl, the most probable cause is the

Explanation:
Water leaking from the tank into the bowl is caused by a faulty flush valve seal—the disc or flapper at the bottom of the tank. If this seal wears, warps, or becomes misaligned, it won’t close properly after the tank refills, allowing water to continuously drain into the bowl. The fill valve and float control how the tank fills and shuts off, not the discharge path, and a gasket at the tank-to-bowl joint would leak at the seam rather than directly into the bowl. Replacing the disc or flapper fixes the seal and stops the unwanted leakage.

Water leaking from the tank into the bowl is caused by a faulty flush valve seal—the disc or flapper at the bottom of the tank. If this seal wears, warps, or becomes misaligned, it won’t close properly after the tank refills, allowing water to continuously drain into the bowl. The fill valve and float control how the tank fills and shuts off, not the discharge path, and a gasket at the tank-to-bowl joint would leak at the seam rather than directly into the bowl. Replacing the disc or flapper fixes the seal and stops the unwanted leakage.

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