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What are the letter and number markings on plumbing pieces?

Plumbing & San Clemente Knowledge Base · 2026-08-07 00:00

This practical introduction to what are the letter and number markings on plumbing pieces covers diagnosis, preparation, safety, and follow-up care. Avoid opening walls, handling sewage, or working near gas or electrical systems without the appropriate training, and verify current local rules before making permanent changes.

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