Illinois Plumbing Code Practice

A ___ or ___ shall be installed at each change of direction of the horizontal building drain system greater than 60 degrees.

1. Bend, Nipple

2. Cleanout, Manhole

3. Elbow, T-fitting

4. Union, Coupling

The correct answer is: Cleanout, Manhole

The correct response indicates that a cleanout or manhole should be installed at each change of direction in the horizontal building drain system that exceeds 60 degrees. This requirement is aimed at ensuring proper maintenance access to the drainage system. Cleanouts provide a necessary point to remove blockages or to conduct inspections and maintenance, while manholes are typically used in larger systems, allowing for easier access to the entire system for inspection and cleaning. The other options do not fulfill the function required by plumbing codes for changes in direction of the drain system. While bends, elbows, and T-fittings support the physical routing of piping, they do not facilitate maintenance access effectively. Unions and couplings are primarily used for connecting pipes rather than permitting access for cleaning or inspection purposes. Thus, the need for cleanouts or manholes at directional changes over 60 degrees is crucial for maintaining the integrity and functionality of the plumbing system.