Plumber Red Seal · Question
The siphonic action that clears the bowl of a standard toilet is initiated by:
When flushed, water from the tank rapidly fills the bowl, raising the water level above the weir of the internal trap. This causes water to spill over and fill
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Question: The siphonic action that clears the bowl of a standard toilet is initiated by:
Answer options:
- The flapper lifting and creating a pressure drop. ✅ Water filling the bowl and overflowing the trap weir, creating a full-bore flow in the trapway.
- A jet of water from the rim holes.
- The vacuum breaker in the fill valve.
Correct answer: Water filling the bowl and overflowing the trap weir, creating a full-bore flow in the trapway.
Explanation: When flushed, water from the tank rapidly fills the bowl, raising the water level above the weir of the internal trap. This causes water to spill over and fill the entire trapway, initiating a siphon that pulls the contents from the bowl.
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