A floor outlet water closet shall connect to which size elbow?

• A. 2 inch elbow
• B. 3 inch elbow
• C. 4 inch elbow
• D. 6 inch elbow

Answer: (C)

A floor outlet water closet is designed to discharge into a sewer line that is sized to handle toilet waste, which is typically 4 inches in diameter. Using a 4-inch elbow aligns with the standard toilet waste line, allowing ample flow and reducing the chance of blockages or siphon issues. Smaller elbows would restrict flow and create drainage problems, while a much larger elbow would be oversized for the typical piping and not fit standard installations. So, the 4-inch elbow is the appropriate size to ensure reliable drainage and compatibility with common toilet waste piping.