Arizona Plumbing Practice Exam 2025 - Free Plumbing Practice Questions and Study Guide

A 4-inch cleanout must have at least 18 inches of clear space horizontally in front of it to ensure accessibility for maintenance and inspection. This requirement is in place to facilitate easy access to the cleanout so plumbers can efficiently perform necessary tasks such as snaking a drain or performing other cleaning procedures. Adequate clearance around plumbing fixtures is vital to prevent obstructions which can delay repairs or lead to ineffective cleaning. Having the correct amount of space also complies with plumbing codes that are designed to ensure safe and practical conditions for plumbing maintenance.