NH/NST Reducers | McMaster-Carr

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	Type Type

	Reducer
	Reducing Adapter
	Valve

	Pipe Size Pipe Size

1 1/2

2 1/2

	Thread Type Thread Type	Show

NH/NST

	Thread Type Thread Type	Hide

UN/UNF (SAE Straight)

	Fire Hose Trade Size Fire Hose Trade Size

3/4

1 1/2

2 1/2

	Gender Gender


Female	Male

	Connection Style Connection Style

Threaded

	Shape Shape


Straight	Wye

	Connection Type Connection Type


Hose	Pipe

	Material Material

Brass

	System of Measurement System of Measurement

Inch

	Length Length

	For Use With For Use With

Water

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Lug Style Lug Style


Rocker	Pin

	Flow Pattern Flow Pattern

Y-Pattern

	Body Material Body Material

Brass

	Swivel Type Swivel Type

Swivels Until Tightened

	Seal Material Seal Material

Rubber

	Valve Type Valve Type

Ball

	Flow Coefficient (Cv) Flow Coefficient (Cv)

Not Rated

	Inlet Location Inlet Location

Center Port

	Number of Ports Number of Ports

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

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25 Products

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.

About Fire-Fighting Hose Threads

Fire-Fighting Hose Fittings

Connect these fittings to fire hydrants and washdown equipment. Made of brass, they have good corrosion resistance. Some have a hex in the middle so you can tighten them with a wrench.

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

For technical drawings and 3-D models, click on a part number.

Straight Reducers, NH/NST Male Threaded Hose

Fire Hose Trade Size
(A)	(B)	Material		Each
2 1/2	1 1/2	Brass	0000000	0000000

Straight Reducing Adapters, NH/NST Male Threaded Hose × NPT Male Threaded Pipe

Fire Hose Trade Size (A)	Pipe Size (B)	Material		Each
1 1/2	1	Brass	0000000	000000
1 1/2	2	Brass	0000000	00000
1 1/2	2 1/2	Brass	0000000	000000
2 1/2	1 1/2	Brass	0000000	000000
2 1/2	2	Brass	0000000	00000
2 1/2	3	Brass	0000000	000000

Straight Reducing Adapters, NH/NST Male Threaded Hose × NH/NST Female Threaded Hose

Fire Hose Trade Size
(A)	(B)	Material		Each
1 1/2	2 1/2	Brass	0000000	000000

Straight Reducing Adapters, NH/NST Male Threaded Hose × NPT Female Threaded Pipe

Fire Hose Trade Size (A)	Pipe Size (B)	Material		Each
1 1/2	1	Brass	0000000	000000
2 1/2	1 1/2	Brass	0000000	00000
2 1/2	2	Brass	0000000	000000

Straight Reducing Adapters, NPT Male Threaded Pipe × NH/NST Female Threaded Hose

PIpe Size (A)	Fire Hose Trade Size (B)	Material		Each
1 1/2	3/4	Brass	0000000	000000
1 1/2	2 1/2	Brass	0000000	000000

Rocker-Lug Fire-Fighting Hose Fittings

The rocker lugs on these fittings allow for easy gripping, so you can quickly connect to fire hydrants and washdown equipment. Tighten with a hook-style spanner wrench (sold separately). Fittings are brass for good corrosion resistance.

NH/NST (National Hose/National Standard) threads are only compatible with other NH/NST threads. Male NPSH (National Pipe Straight Hose) threads are compatible with female NPSH threads. Female NPSH threads are compatible with male NPSH, NPT, NPTF, and NPSM threads.

For technical drawings and 3-D models, click on a part number.

Straight Reducing Adapters, NH/NST Male Threaded Hose × NH/NST Female Threaded Hose

Fire Hose Trade Size
(A)	(B)	Material		Each
1	1 1/2	Brass	0000000	000000
1	2 1/2	Brass	0000000	00000
1 1/2	2 1/2	Brass	0000000	00000
2 1/2	1 1/2	Brass	0000000	000000

Straight Reducing Adapters, NH/NST Male Threaded Hose × NPSH Female Threaded Hose

Fire Hose Trade Size (A)	Pipe Size (B)	Material		Each
1 1/2	2 1/2	Brass	0000000	000000

Straight Reducing Adapters, NPSH Male Threaded Hose × NH/NST Female Threaded Hose

PIpe Size (A)	Fire Hose Trade Size (B)	Material		Each
1 1/2	2 1/2	Brass	0000000	000000

Straight Reducing Adapters, NPT Male Threaded Pipe × NH/NST Female Threaded Hose

PIpe Size (A)	Fire Hose Trade Size (B)	Material		Each
1	1 1/2	Brass	0000000	000000
1	2 1/2	Brass	0000000	00000
2	2 1/2	Brass	0000000	00000

Pin-Lug Fire-Fighting Hose Fittings

The pin lugs on these fittings allow for easy gripping, so you can quickly connect to fire hydrants and washdown equipment. Tighten with a hook-style spanner wrench (sold separately). All are brass for good corrosion resistance.

Fittings that swivel until tightened rotate to help prevent kinking during installation.

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

For technical drawings and 3-D models, click on a part number.

Straight Reducing Adapters (Swivels Until Tightened), NH/NST Female Threaded Hose × NPT Female Threaded Pipe

Fire Hose Trade Size (A)	Pipe Size (B)	Material		Each
2 1/2	2	Brass	0000000	0000000

Straight Reducing Adapters (Swivels Until Tightened), NPT Male Threaded Pipe × NH/NST Female Threaded Hose

PIpe Size (A)	Fire Hose Trade Size (B)	Material		Each
2	2 1/2	Brass	0000000	0000000

Diverting Valves with Fire-Fighting Hose Fittings

Valve Type: Ball
For Use With: Water
Seal Material: Buna-N Rubber

Control the flow of water in two directions from a single source—these diverting valves have two balls and handles for independent operation of each outlet. They can direct flow to one side outlet at full capacity while shutting off flow to the second side outlet, direct flow to both side outlets at reduced capacity, or shut off flow to both side outlets. Valves have a brass body for good corrosion resistance. They are for use with fire-fighting hose.

Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.

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

For technical drawings and 3-D models, click on a part number.

NH/NST Female × NH/NST Male × NH/NST Male

Brass Body
Inlet Fire Hose Trade Size	Outlet Fire Hose Trade Sizes	Flow Pattern	Flow Coefficient (Cv)	Max. Pressure	Temp. Range, °F	End-to-End Lg.		Each
2 1/2	1 1/2 × 1 1/2	Y-Pattern	Not Rated	300 psi @ 150° F	-20° to 150°	5 5/8"	000000	0000000