When assembling threaded pipe and fittings, joint compound (pipe dope) is applied to which threads?

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Study for the NOCTI Plumbing Test. Prepare with flashcards and multiple choice questions, each question comes with hints and explanations. Ensure your success on the exam!

Multiple Choice

When assembling threaded pipe and fittings, joint compound (pipe dope) is applied to which threads?

Explanation:
Sealant is applied to the male (external) threads because the compound fills the gaps as the joint is tightened, creating the seal and giving the threads a smoother bite. Keeping the female (internal) threads clean avoids pushing dope into the pipe bore, which could contaminate the system or hinder proper seating. So, the best practice is to apply pipe dope to the male threads only.

Sealant is applied to the male (external) threads because the compound fills the gaps as the joint is tightened, creating the seal and giving the threads a smoother bite. Keeping the female (internal) threads clean avoids pushing dope into the pipe bore, which could contaminate the system or hinder proper seating. So, the best practice is to apply pipe dope to the male threads only.

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