Illinois Plumbing Code Practice

The correct answer highlights the specific materials and types of connections required for compression type joints in plumbing using copper or brass tubes. Brass ferrules are designed to provide a secure and watertight seal when compressed onto the tube, making them ideal for this application due to their corrosion resistance and strength. The mention of a ground joint ensures that surface contact is well-prepared to optimize the sealing capability and prevent leaks. Using stainless steel for the compression connection adds to the durability and resistance to corrosion, especially in environments where moisture may be present. It enhances the performance of the joint by maintaining integrity under varying pressure conditions, thus ensuring the reliability of the plumbing system. Other options may suggest materials or connection types that do not align with the best practices established in plumbing codes, which might lead to inferior performance or failure of the joints over time.