Fire Hydrant Plugs | McMaster-Carr

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9 Products

About Measuring Fittings

Measure the threaded ends of your fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.

Rocker-Lug Fire Hydrant Caps

Thread these caps 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 are brass for good corrosion resistance.

NH/NST Thread—NH/NST (National Hose/National Standard) threads are only compatible with other NH/NST threads.

NPSH Thread—NPSH (National Pipe Straight Hose) threads are compatible with male NPSH, NPT, NPTF and NPSM threads.

Fire Hose Trade Size	Thread Type	Material	Lg.	Chain Lg.		Each
1	NH/NST	Brass	1 7/32"	9"	6525T171	000000
1 1/2	NH/NST	Brass	1 1/8"	9"	6525T141	00000
1 1/2	NPSH	Brass	1 1/8"	9"	6525T111	00000
2 1/2	NH/NST	Brass	1 7/16"	9"	6525T161	00000
2 1/2	NPSH	Brass	1 9/16"	9"	6525T112	00000

Rocker-Lug Fire Hydrant Plugs

Thread these 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). Plugs are brass for good corrosion resistance.

NH/NST Thread—NH/NST (National Hose/National Standard) threads are only compatible with other NH/NST threads.

Chicago Fire Department Thread—Chicago Fire Department threads are only compatible with other Chicago Fire Department threads.

Fire Hose Trade Size	Thread Type	Material	Lg.	Chain Lg.		Each
1 1/2	NH/NST	Brass	1 11/16"	9"	6527T16	000000
2 1/2	NH/NST	Brass	2 3/32"	9"	6527T11	00000
2 1/2	Chicago Fire Department	Brass	2 3/32"	9"	6527T14	00000

Quick-Access Pin-Lug Fire Hydrant Caps

These caps are the fastest way to access fire hydrants and washdown equipment. To install them, loop the eyebolts over the pin lugs of the hydrant and secure them in place with nuts. In an emergency, break the cap by hitting it or prying it off with a spanner wrench. Caps are aluminum, which is lightweight with good corrosion resistance.

For Fire Hose Trade Size	Material	Lg.		Each
2 1/2	Aluminum	3 1/2"	6528T3	000000