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How to Identify and Measure Fittings
Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.
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About Fire-Fighting Hose Threads
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Rocker-Lug Fire Hydrant Caps and Plugs

Plug
Thread these caps and plugs onto fire hydrants and washdown equipment to close off the line. Their rocker lugs are easy to grip, so you can tighten them quickly. Tighten with a hook-style spanner wrench (not included). Caps and plugs are brass for good corrosion resistance.
Chicago Fire Department threads are only compatible with other Chicago Fire Department threads.
Fire Hose Trade Size | Thread Type | Material | Lg. | Chain Lg. | Each | |
Plug | ||||||
---|---|---|---|---|---|---|
2 1/2 | Chicago Fire Department | Brass | 2 3/32" | 9" | 0000000 | 000000 |