Which type of trap is prohibited for residential use?

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Study for the NOCTI Plumbing Test. Prepare with flashcards and multiple choice questions, each question comes with hints and explanations. Ensure your success on the exam!

Multiple Choice

Which type of trap is prohibited for residential use?

Explanation:
Drum traps are prohibited for residential use because their design cannot provide reliable venting and a lasting water seal. The large, cylindrical body makes it easy for the trap seal to be lost through siphonage and it’s difficult to vent properly within typical home plumbing layouts. They also lack an accessible cleanout, making maintenance and inspection impractical. Modern residential plumbing uses vented traps that maintain the water seal, prevent sewer gas from escaping, and allow for proper cleaning, so drum traps don’t meet current code requirements.

Drum traps are prohibited for residential use because their design cannot provide reliable venting and a lasting water seal. The large, cylindrical body makes it easy for the trap seal to be lost through siphonage and it’s difficult to vent properly within typical home plumbing layouts. They also lack an accessible cleanout, making maintenance and inspection impractical. Modern residential plumbing uses vented traps that maintain the water seal, prevent sewer gas from escaping, and allow for proper cleaning, so drum traps don’t meet current code requirements.

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