What does a plug do in a plumbing fitting?

Closes off a pipe opening.

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  1. Closes off a pipe opening ✔
  2. Joins three pipes
  3. Measures flow

Why: A plug seals or closes an opening in a pipe or fitting.

Huh, didn't know that: A plug seals or closes an opening in a pipe or fitting.

The dad joke
A plug is the end of the line.
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References

Answer: Closes off a pipe opening. A plug seals or closes an opening in a pipe or fitting.

  1. Scouting America: Plumbing www.scouting.org/merit-badges/plumbing
    Identify and explain the following terms: washer, retaining nut, plunger (rubber force cup), solder, flux, elbow, tee, nipple, coupling, plug, union, trap
    Checked 2026-11-07.

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