For hubless cast iron couplings, what feature helps prevent pipe ends from contacting each other?

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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

For hubless cast iron couplings, what feature helps prevent pipe ends from contacting each other?

Explanation:
In hubless cast iron couplings, keeping the pipe ends from touching each other is achieved by a rubber center stop. This compressible piece sits in the middle of the coupling bore and acts as a spacer between the ends, maintaining a small gap while the gasket seals the joint. It also helps align the pipes and absorb minor misalignments and movement, so the ends don’t butt against one another and saddle the joint with stress. The rubber center stop is preferred because it provides both spacing and cushioning, which a gasket alone cannot do, and it isn’t as rigid as a metal center ring or as potentially incompatible as a plastic sleeve.

In hubless cast iron couplings, keeping the pipe ends from touching each other is achieved by a rubber center stop. This compressible piece sits in the middle of the coupling bore and acts as a spacer between the ends, maintaining a small gap while the gasket seals the joint. It also helps align the pipes and absorb minor misalignments and movement, so the ends don’t butt against one another and saddle the joint with stress. The rubber center stop is preferred because it provides both spacing and cushioning, which a gasket alone cannot do, and it isn’t as rigid as a metal center ring or as potentially incompatible as a plastic sleeve.

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