Plumber Red Seal · Question
To prevent siphonage of a fixture trap, what must every fixture trap be protected by?
Every fixture trap must be protected by a vent pipe to prevent siphonage and back-pressure. The vent pipe introduces atmospheric pressure into the drainage syst
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Question: To prevent siphonage of a fixture trap, what must every fixture trap be protected by?
Answer options:
- A floor drain
- A backwater valve ✅ A vent pipe
- A pressure relief valve
Correct answer: A vent pipe
Explanation: Every fixture trap must be protected by a vent pipe to prevent siphonage and back-pressure. The vent pipe introduces atmospheric pressure into the drainage system, protecting the water seal in the trap.
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