Massachusetts Plumbers Journeyman Practice Exam

For pipes three inches or larger, what is the minimum clearance required for cleanouts?

1. 6 inches

2. 12 inches

3. 18 inches

4. 24 inches

The correct answer is: 18 inches

The minimum clearance required for cleanouts in pipes three inches or larger is 18 inches. This requirement is in place to ensure adequate access for maintenance, inspection, and potential repairs. Having sufficient space around the cleanout allows plumbers to easily open and work within the pipe system without obstructions, which is critical for effective plumbing practices. In professional plumbing, adhering to proper clearances is essential for compliance with building codes and for maintaining functionality and safety within plumbing systems. These clearances help prevent complications that could arise if a cleanout is not easily accessible, such as the inability to clear blockages.