Aluminum 1" Female NPSH to Male GHT

Item Number: 37R1PG
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  • Made In USA
  • Weight: 0.18 lb
  • Female Side: 1 inch NPSH
  • The Female Will Only Connect to a Male 1 inch NPSH or NPT
  • Male Side: GHT
  • The Male Will Only Connect to a Female GHT
  • Material: 6061-T6 Aluminum
  • Finish: Hard Coat Anodized
  • Complies With NFPA 1963 (Corrosion Resistance)
  • 99.95% Lead-Free

Description

The Aluminum 1" Female NPSH to Male GHT adapter reduces a 1" NPSH hose connection to a 3/4" Garden Hose Thread. Proudly Made in the USA, it features seamless 6061-T6 aluminum construction with a hard coat anodized finish for corrosion and abrasion resistance. This 99.95% lead-free adapter meets Forest Service Spec 5100-107, NFES #0733, and NFPA 1963, making it suitable for wildland firefighting applications by agencies such as the U.S. Forest Service. It includes an EPDM gasket and has a maximum working pressure of 600 PSI.

Help Me Connect

  • The female side of a garden hose will only connect to a male garden hose connection.
  • The male side of a garden hose will only connect to a female garden hose connection.

NH / NST: The most common thread type in use by fire departments today is NST or National Standard Thread. NST also goes by the initials NH or National Hose. It can even be referred to as NHT or National Hose Thread but NST or NH is more common these days. NH = NST.

  • The female side of a NH / NST coupling will only connect to a male NH / NST connection
  • The male side of a NH / NST coupling will only connect to a female NH / NST connection

NPSH: National Pipe Straight Hose (NPSH) or Iron Pipe Thread (IPT) has the same threads per inch (TPI) as National Pipe Tapered (NPT) but the thread does not taper. NPSH is a straight thread and seals by a gasket in the female coupling which allows for a swivel, just like NH / NST, which make both ideal for hose couplings.

  • The female side of a NPSH coupling will only connect to a male NPT pipe or a male NPSH connection
  • The male side of a NPSH coupling will only connect to a female NPSH connection.
    It will NOT thread into a female NPT pipe. For example, a male NPSH coupling will NOT thread into a female metal or pvc pipe.

NPT: National Pipe Tapered is common in plumbing and some industrial uses. Sometimes referred to as pipe thread because PVC pipe and schedule 40 pipe are typically threaded in NPT. As its name implies this is a tapered thread so that the outside diameter of the male (ODM) gets smaller towards the end of the fitting and the inside diameter of the female narrows with depth. As the two fittings are threaded together the opposite tapers force thread friction and makes the seal without the use of a gasket.

Warranty Information

Limited Lifetime Warranty - We will replace any adapters with manufacturer defects in material and workmanship. All warranty claims must be returned to us for inspection before we determine a solution.

Our warranty does not cover gaskets, multiple use of NPT threads, shipping cost, cosmetic damages, normal wear-and-tear, improper use or chemical damage.

Adapters purchased for use at Fire Training Facilities will have a 90-day Manufacturer Defect warranty only.

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Additional Details

USDA Forestry Service fire hose reducer feature aluminum coupling with a 600 psi test pressure. Meet Forest Service Spec 5100-107. Female 1" NPSH 11 1/2 threads per inch and male 3/4" GHT (Garden Hose Thread). Meets National Fire Equipment System (NFES #0733). Water-Handling Accessories flow rates are 100 PSI flowing pressure.

Fire hose reducer female adapters comes with a gasket.

National Stock Number (NSN 4210-01-079-9286)

This Wildland Fire Equipment adapter or coupling is used by the U.S. Forest Service (USFS), Bureau of Land Management (BLM), Bureau of Indian Affairs (BIA), U.S. Fish & Wildlife Service (USF&WS), National Park Service (NPS), State and Local governments, and other Forest Service–sponsored participants in the government-wide wildland firefighting effort.

This is the same water-handling accessories reducer found in the Defense Logistics Agency (DLA) Wildland Fire Equipment catalog or Fedmall.mil.

The Safe Water Drinking Act section 1417 requires "Lead-Free" products to be a minimum of 99.75% lead-free.

Aluminum Female to Male Adapter

Specifications

Garden Hose Thread Male Adapter
  • Outside diameter of a male GHT adapter: 1 1/16 inches (1.06) - 11.5 Threads per inch
  • Garden hose thread is not the same as 3/4 inch pipe thread (NPT)
1" Male Adapter
  • Inside diameter of a male adapter: 1 inch
  • Outside diameter of a male NH / NST adapter: 1 3/8 inches (1.375) - 8 Threads per inch
  • Outside diameter a male NPSH or NPT adapter: 1 5/16 inches (1.295) - 11.5 Threads per inch
1 1/2" Male Adapter
  • Inside diameter of a male adapter: 1 1/2 inches
  • Outside diameter of a male NH / NST adapter: 2 inches (1.99) - 9 Threads per inch
  • Outside diameter a male NPSH or NPT adapter: 1 7/8 inches (1.87) - 11.5 Threads per inch
1 3/4" Hose Couplings
  • 1 3/4 inch hoses come with 1 1/2 inch couplings
2" Male Adapter
  • Inside diameter of a male adapter: 2 inches
  • Outside diameter of a male NH / NST adapter: 2 1/2 inches (2.51) - 8 Threads per inch
  • Outside diameter a male NPSH or NPT adapter: 2 3/8 inches (2.35) - 11.5 Threads per inch

Note: 2 inch NH or NST is very rare. If the outside diameter of male adapter is approximately two inches, you need 1 1/2 inch NH or NST.

2 1/2" Male Adapter
  • Inside diameter of a male adapter: 2 1/2 inches
  • Outside diameter of a male NH / NST adapter: 3 1/16 inches (3.06) - 7.5 Threads per inch
  • Outside diameter a male NPSH or NPT adapter: 2 7/8 inches (2.84) - 8 Threads per inch
3" Hose Couplings
  • Most 3 inch hoses come with 2 1/2 inch couplings
  • Inside diameter of a male adapter: 3 inches
  • Outside diameter of a male NH / NST adapter: 3 5/8 inches (3.62) - 6 Threads per inch
  • Outside diameter a male NPSH adapter: 3 1/2 inches (3.47) - 8 Threads per inch
  • Outside diameter a male NPT adapter: 3 3/8 inches (3.38) - 8 Threads per inch
4" Male Adapter
  • Inside diameter of a male adapter: 4 inches
  • Outside diameter of a male NH / NST adapter: 5 inches (5.01) - 4 Threads per inch
  • Outside diameter a male NPSH adapter: 4 1/2 inches (4.47) - 8 Threads per inch
4 1/2” Male Adapter
  • Inside diameter of a male adapter: 4 1/2 inches
  • Outside diameter of a male NH / NST adapter: 5 3/4 inches (5.76) - 4 Threads per inch
  • Outside diameter a male NPSH or NPT adapter: 5 inches (4.97) - 8 Threads per inch
5" Male Adapter
  • Inside diameter of a male adapter: 5 inches
  • Outside diameter of a male NH / NST adapter: 6 1/4 inches (6.26) - 4 Threads per inch
  • Outside diameter of a male NPSH adapter: 5 9/16 inches (5.56) - 8 Threads per inch
  • Outside diameter of a male NPT adapter: 5 7/16 inches (5.44) - 8 Threads per inch
6" Male Adapter
  • Inside diameter of a male adapter: 6 inches
  • Outside diameter of a male NH / NST adapter: 7 1/32 inches (7.025) - 4 Threads per inch
  • Outside diameter of a male NPSH adapter: 6 5/8 inches (6.62) - 8 Threads per inch
  • Outside diameter of a male NPT adapter: 6 1/2 inches (6.50) - 8 Threads per inch

FAQs

What are the thread types and sizes for this adapter?

This adapter features a 1" Female NPSH connection, which connects to a male 1" NPSH or NPT, and a 3/4" Male GHT (Garden Hose Thread) connection, which connects to a female 3/4" GHT.

What material is this adapter made from?

The adapter components are made from seamless aluminum, alloy 6061-T6, with a hard coat anodized finish for durability and resistance to corrosion and abrasion.

What is the maximum working pressure of this adapter?

This adapter has a maximum working pressure of 600 PSI and can withstand a hydrostatic test of 1000 PSI.

Is a gasket included with this adapter?

Yes, the adapter comes with an EPDM gasket to ensure a proper seal for the hose connections.

What certifications and specifications does this adapter meet?

This adapter meets Forest Service Spec 5100-107, NFES #0733, and complies with NFPA 1963 (Corrosion Resistance). It also conforms to Federal Handbook, USDA, NFPA, and UL thread specifications.

Who is the primary intended user for this adapter?

This adapter is commonly used by the U.S. Forest Service, Bureau of Land Management, Bureau of Indian Affairs, U.S. Fish & Wildlife Service, National Park Service, and other state and local government participants in wildland firefighting efforts.

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