CSLB C-36 Plumbing ContractorFixture and Appliance InstallationEasy
During the installation of a new kitchen sink, a plumber notices that the existing P-trap is made of galvanized steel and shows significant corrosion. The local plumbing code requires all drainage piping to be made of approved, corrosion-resistant materials. What action should the plumber take?
- AClean the existing galvanized steel P-trap and reinstall it, as it is still functional.
- BReplace the galvanized steel P-trap with a new one of the same material to match existing plumbing.
- CApply a corrosion-resistant coating to the existing P-trap and reinstall it.
- DReplace the galvanized steel P-trap with an approved material such as PVC or ABS.
Show answer & explanationAnswer & explanation
Correct answer: D. Replace the galvanized steel P-trap with an approved material such as PVC or ABS.
Galvanized steel P-traps are prone to corrosion and are generally not permitted or recommended by current plumbing codes. Replacing it with an approved, corrosion-resistant material like PVC or ABS is the correct action to ensure compliance and longevity.
Why the other options are wrong
- A. Reinstalling a corroded and non-compliant material is against code and poor practice.
- B. Replacing with the same non-compliant material would perpetuate the problem and violate code.
- C. Coatings are temporary fixes and do not address the underlying material's non-compliance or existing corrosion.
P-Trap Material Compliance
The requirement for P-traps to be constructed from code-approved, corrosion-resistant materials to ensure proper drainage and prevent leaks.
- Galvanized steel is generally not approved for P-traps due to corrosion.
- Common approved materials include PVC, ABS, and brass.
- Ensures longevity and prevents blockages from corrosion flakes.
Memory trick: P-traps need to 'Prevent Problems' with proper materials.