What is the Recommended Drain Size for Water Closets? Compliance with Standard Plumbing Codes

as an experienced plumber, what is the recommended size of the drain serving water closet?

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The recommended size of the drain serving a water closet is 3 inches in diameter. This is in compliance with the standard plumbing codes. The 3-inch drain is capable of handling the waste and water supply required by a water closet.

If the drain size is smaller than 3 inches, it might lead to clogging and poor drainage. If you plan to install a new water closet, it’s important to consult a professional plumber to ensure that the drain size is sufficient for the fixture’s requirements.

It’s also important to note that local plumbing codes may differ, so it’s always best to consult with your local plumbing authority before undertaking any plumbing installations or alterations.

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