To what type of connections should sealing tape and pipe joint compounds be applied?

Sealing tape and pipe joint compounds are primarily used on male thread connections to ensure a watertight seal. Male threads are designed to screw into female threads, and the use of sealing tape or joint compound around the male threads helps to fill gaps and prevent leaks that can occur due to imperfections in the threading or misalignment.

Using these materials on male threads takes advantage of their design; as the male thread is screwed into the female connection, the tape or compound is compressed, creating a tight seal. This is crucial for maintaining the integrity of plumbing systems, especially in pressurized applications where leaks can lead to significant issues.

In plumbing practice, while some may apply these materials to female threads as well, the main purpose is to ensure a proper seal on male connections since they are the part that engages directly with the female threads. Therefore, the correct focus is on the treatment of male threads to ensure that connections made within a plumbing system are secure and leak-free.