What is the minimum required size for a building sewer cleanout according to the 2022 CPC?

• 3 inches for pipes 3 inches and smaller, 4 inches for larger pipes.
• 4 inches, regardless of pipe size.
• The same size as the pipe served, but not less than 2 inches.
• The same size as the pipe served up to 4 inches; for larger pipes, not less than 4 inches.