The full name of an OS&Y valve is:

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Multiple Choice

The full name of an OS&Y valve is:

Explanation:
OS&Y stands for Outside-stem-and-yoke valve. The stem and its yoke are located outside the valve body, usually visible above the bonnet, which makes the valve position easy to see and inspect. This formal, hyphenated name is the standard designation used in NFPA/fire protection terminology. The other options either drop the hyphens or add “cap,” which isn’t part of the term.

OS&Y stands for Outside-stem-and-yoke valve. The stem and its yoke are located outside the valve body, usually visible above the bonnet, which makes the valve position easy to see and inspect. This formal, hyphenated name is the standard designation used in NFPA/fire protection terminology. The other options either drop the hyphens or add “cap,” which isn’t part of the term.

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