What is the minimum clearance required for access to a 3" or larger cleanout?

The correct answer is based on the Massachusetts Plumbing Code, which stipulates that a minimum clearance of 18 inches is necessary for access to a 3" or larger cleanout. This requirement ensures that plumbing professionals can safely and effectively access the cleanout for maintenance, inspection, and cleaning purposes without obstruction. Adequate clearance is essential for both safety and efficiency, as it allows for proper tools and equipment to be used without difficulty.

The specifications are designed to prevent potential issues that may arise from inadequate access, such as damaging pipes or creating hazardous working conditions. Thus, having 18 inches of clearance supports compliance with safety standards and operational effectiveness in plumbing practices.