What is the primary function of a Fernco coupling?

The primary function of a Fernco coupling is to connect pipes of different materials, making option B the most accurate choice. Fernco couplings are specifically designed to accommodate the expansion, contraction, and misalignment that occur in piping systems, particularly when connecting dissimilar materials such as PVC to cast iron or other types of pipe.

This flexibility allows them to create a secure and leak-free joint, which is essential for maintaining the integrity of plumbing and drainage systems. By using Fernco couplings, public works managers can effectively address the challenges that come with various piping materials, ensuring a robust and reliable infrastructure.

Although other functions like preventing leaks or joining similar types of pipes might be related to couplings in general, they do not capture the unique capability of Fernco couplings to facilitate connections across various pipe materials.