Why does 1/2 inch PVC need an adapter to join 1/2 inch tubing?

PVC uses a different sizing scheme.

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  1. PVC uses a different sizing scheme ✔
  2. PVC is always larger than labeled
  3. Tubing cannot be joined at all

Why: PVC uses iron pipe size, which differs from nominal tubing size, so an adapter is needed.

Huh, didn't know that: PVC uses iron pipe size, which differs from nominal tubing size, so an adapter is needed.

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That adapter bridges a sizeable gap.
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References

Answer: PVC uses a different sizing scheme. PVC uses iron pipe size, which differs from nominal tubing size, so an adapter is needed.

  1. Plumbing en.wikipedia.org/wiki/Plumbing
    1/2" PVC on the other hand is not the same size as 1/2" tubing
    Checked 2026-11-07.

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