Illinois Plumbing Code Practice

Brazed joints shall be made by first cleaning the surface to be joined down to the base metal, applying flux approved for brazed joints and for the filler metal to be used, and making the joints by heating to a temperature sufficient to melt the approved brazing filler metal on contact. An extracted mechanical joint may be made in copper tube types ___ or ___ only for water distribution.

1. I, J

2. K, J

3. K, L

4. L, M

The correct answer is: K, L

The correct answer is based on the standards set forth in the Illinois Plumbing Code regarding the types of copper tubing that are suitable for certain applications, specifically in water distribution systems. In this context, types K and L copper tubing are specifically approved for various plumbing applications due to their thickness and durability. Type K copper pipe is known for its thick walls and high pressure capabilities, making it suitable for underground and other pressure applications. Type L, while slightly thinner than type K, is also robust enough for a variety of plumbing tasks, including both water distribution and other applications. When addressing brazed joints, the requirement for the specific types of copper tubing aims to ensure that the joints can withstand the conditions they will be exposed to over time. The other options either involve types of copper tubing not recognized for water distribution or those that do not meet the necessary standards of durability and strength required for plumbing applications. Thus, identifying K and L as the correct types ensures compliance with the plumbing code and promotes system integrity.