Plumber Red Seal · Question
A plumber is installing a 100 mm cast iron sanitary drainage stack in a multi-story commercial building. Which type of joint is most commonly used for hubless cast iron piping in this application?
For hubless cast iron piping, mechanical compression joints, commonly known as no-hub couplings, are the standard method for joining. Caulked lead joints are us
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Question: A plumber is installing a 100 mm cast iron sanitary drainage stack in a multi-story commercial building. Which type of joint is most commonly used for hubless cast iron piping in this application?
Answer options:
- Caulked lead joint ✅ Mechanical compression joint (no-hub coupling)
- Solvent welded joint
- Threaded joint
Correct answer: Mechanical compression joint (no-hub coupling)
Explanation: For hubless cast iron piping, mechanical compression joints, commonly known as no-hub couplings, are the standard method for joining. Caulked lead joints are used with hub and spigot cast iron, while solvent welded and threaded joints are not applicable to cast iron DWV.
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