Plumber Red Seal · Question
According to the NPC, which type of fitting is prohibited at the base of a sanitary drainage stack where the flow changes from vertical to horizontal?
A sanitary tee is designed for horizontal-to-vertical flow transition and creates excessive turbulence and solids buildup if used at the base of a stack, where
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Question: According to the NPC, which type of fitting is prohibited at the base of a sanitary drainage stack where the flow changes from vertical to horizontal?
Answer options:
- A short-sweep 1/4 bend
- Two 1/8 bends
- A long-sweep 1/4 bend ✅ A sanitary tee used on its back
Correct answer: A sanitary tee used on its back
Explanation: A sanitary tee is designed for horizontal-to-vertical flow transition and creates excessive turbulence and solids buildup if used at the base of a stack, where a long-sweep fitting is required for a smooth change of direction.
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