2½ inch hose couplings use which standard thread?

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Multiple Choice

2½ inch hose couplings use which standard thread?

Explanation:
2½ inch hose couplings use National Standard Thread. This hose-specific threading was created to fit hose fittings and seal with a gasket, using straight threads that mate together cleanly and securely. It’s different from pipe threads used for piping systems. American National Pipe Thread is a tapered pipe thread designed for pipe joints, and wouldn’t seal properly or align correctly on hose couplings. The other options are not used for standard firefighting hose connections. So the hose, at this size, is designed around NST.

2½ inch hose couplings use National Standard Thread. This hose-specific threading was created to fit hose fittings and seal with a gasket, using straight threads that mate together cleanly and securely. It’s different from pipe threads used for piping systems. American National Pipe Thread is a tapered pipe thread designed for pipe joints, and wouldn’t seal properly or align correctly on hose couplings. The other options are not used for standard firefighting hose connections. So the hose, at this size, is designed around NST.

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