Plumber Red Seal · Question
A plumber is inspecting a cross-connection where a hose is connected to a potable water spigot and submerged in a garden pond containing pesticide-treated water. Which backflow prevention device is required by the National Plumbing Code of Canada for this high-hazard situation?
A garden pond with pesticide-treated water represents a high-hazard, continuous pressure cross-connection. The National Plumbing Code mandates a Reduced Pressur
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Question: A plumber is inspecting a cross-connection where a hose is connected to a potable water spigot and submerged in a garden pond containing pesticide-treated water. Which backflow prevention device is required by the National Plumbing Code of Canada for this high-hazard situation?
Answer options:
- Double check valve assembly (DCVA)
- Pressure vacuum breaker (PVB) ✅ Reduced pressure principle backflow preventer (RP)
- Atmospheric vacuum breaker (AVB)
Correct answer: Reduced pressure principle backflow preventer (RP)
Explanation: A garden pond with pesticide-treated water represents a high-hazard, continuous pressure cross-connection. The National Plumbing Code mandates a Reduced Pressure Principle Backflow Preventer (RP) for such applications, as it provides the highest degree of protection against both backpressure and backsiphonage in high-hazard conditions.
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