Couplings for mechanical hubless cast iron (no-hub) must have a/an?

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Study for the NOCTI Plumbing Test. Prepare with flashcards and multiple choice questions, each question comes with hints and explanations. Ensure your success on the exam!

Multiple Choice

Couplings for mechanical hubless cast iron (no-hub) must have a/an?

Explanation:
Hubless cast-iron no-hub couplings rely on an intentional center stop to keep the joint from shifting along the pipe and to ensure the gasket stays properly seated. Without a hub at the pipe end, there’s nothing else to halt the two halves from sliding apart as you tighten bolts or as the system experiences pressure or movement. The center stop provides a physical boundary between the pipe ends, maintaining alignment, ensuring even gasket compression, and helping the connection stay watertight. Rubber gaskets are used, but the center stop is the specific feature that makes hubless joints reliable, which is why it’s required.

Hubless cast-iron no-hub couplings rely on an intentional center stop to keep the joint from shifting along the pipe and to ensure the gasket stays properly seated. Without a hub at the pipe end, there’s nothing else to halt the two halves from sliding apart as you tighten bolts or as the system experiences pressure or movement. The center stop provides a physical boundary between the pipe ends, maintaining alignment, ensuring even gasket compression, and helping the connection stay watertight. Rubber gaskets are used, but the center stop is the specific feature that makes hubless joints reliable, which is why it’s required.

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