Plumber Red Seal · Question
A plumber is troubleshooting a hot tub filling issue where the water fill connection is permanently submerged. To prevent potential contamination of the potable water supply, what minimum backflow prevention is required by the National Plumbing Code of Canada (NPC)?
For a hot tub filling connection that is permanently submerged, creating a high hazard cross-connection due to the potential for disease-causing organisms and c
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Question: A plumber is troubleshooting a hot tub filling issue where the water fill connection is permanently submerged. To prevent potential contamination of the potable water supply, what minimum backflow prevention is required by the National Plumbing Code of Canada (NPC)?
Answer options:
- Hose connection vacuum breaker ✅ Air gap
- Double check valve assembly (DCVA)
- Pressure vacuum breaker (PVB)
Correct answer: Air gap
Explanation: For a hot tub filling connection that is permanently submerged, creating a high hazard cross-connection due to the potential for disease-causing organisms and chemicals, the NPC requires an air gap as the most reliable backflow prevention method. An air gap physically separates the potable water supply from the contaminated source.
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