What gauge brass must all tubing used for tail pieces in commercial installations be?

The correct choice is based on industry standards that dictate the use of specific gauge brass for tubing intended for tail pieces in commercial plumbing installations. A gauge of 17 brass is typically required because it provides strength, durability, and adequate resistance to corrosion for the intended application. This gauge is thick enough to prevent bending or damage during installation and use, ensuring longevity and reliability in commercial settings where plumbing is subjected to frequent use and maintenance.

Using a lower gauge, like 20, 22, or 24, would mean thinner and weaker tubing that might not withstand the operational demands, potentially leading to issues such as leaks or breaks over time. Therefore, the choice of 17 gauge brass strikes a balance between functionality and durability, making it the standard for tail piece tubing in these environments.