Master Plumber Practice Exam 2025 - Free Plumber Practice Questions and Study Guide

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What is the required minimum vertical distance of a food waste grinder above the fixture rim?

4 inches

The required minimum vertical distance of a food waste grinder above the fixture rim is 4 inches. This standard is in place to prevent any potential backflow or contamination from the waste grinder into the sink or plumbing system, which is crucial for maintaining health and safety standards in the kitchen. The elevation ensures that waste water cannot siphon back into the grinder from the sink, thereby avoiding any risk of cross-connection. This guideline is also part of plumbing codes that aim to safeguard sanitation and compliance with hygiene regulations in residential and commercial settings.

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3 inches

2 inches

1 inch

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