Aha Trivia Stuff Everyone Should Know
Aha Trivia: Stuff Everyone Should Know · ahatrivia.com/mb-plumbing-cb8b363fd6a9

Why does 1/2 inch PEX connect easily to 1/2 inch copper tubing?

Both are measured nominally the same size.

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  1. Both are made of the same plastic
  2. Both use iron pipe size threads
  3. Both are measured nominally the same size ✔

Why: Tubing like PEX and copper is measured nominally, so 1/2 inch sizes match for fittings.

Huh, didn't know that: Tubing like PEX and copper is measured nominally, so 1/2 inch sizes match for fittings.

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References

Answer: Both are measured nominally the same size. Tubing like PEX and copper is measured nominally, so 1/2 inch sizes match for fittings.

  1. Plumbing en.wikipedia.org/wiki/Plumbing
    1/2" PeX tubing is the same size as 1/2" copper tubing
    Checked 2026-11-07.

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