Plumber Red Seal · Question
A plumber needs to connect a 3-inch horizontal drainpipe to a 4-inch vertical stack. What is the most appropriate fitting combination to use for this connection?
When connecting a horizontal drain to a vertical stack, a wye and 1/8 bend (45-degree) combination is required. This configuration ensures a smooth, sweeping fl
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Question: A plumber needs to connect a 3-inch horizontal drainpipe to a 4-inch vertical stack. What is the most appropriate fitting combination to use for this connection?
Answer options:
- A 4-inch x 3-inch sanitary tee ✅ A 4-inch x 3-inch wye and 1/8 bend
- A 4-inch x 3-inch closet bend
- A 4-inch x 3-inch bushing inside a 4-inch tee
Correct answer: A 4-inch x 3-inch wye and 1/8 bend
Explanation: When connecting a horizontal drain to a vertical stack, a wye and 1/8 bend (45-degree) combination is required. This configuration ensures a smooth, sweeping flow transition that prevents solids from accumulating and causing blockages.
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