US Fire Hose

Brass 2 1/2" NH to 2 1/2" NPSH Double Male (Pin Lug)

Garden Hose Thread Male Adapter

Outside diameter of a male GHT adapter - 1.06 inches (11.5 Threads per inch)

1" Male Adapter

Inside diameter of a male adapter - 1 inch
Outside diameter of a male NH / NST adapter - 1.375 inches (8 Threads per inch)
Outside diameter a male NPSH or NPT adapter - 1.295 inches (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 - 1.99 inches (9 Threads per inch)
Outside diameter a male NPSH or NPT adapter - 1.87 inches (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 inch
Outside diameter of a male NH / NST adapter - 2.51 inches (8 Threads per inch)
Outside diameter a male NPSH or NPT adapter - 2.35 inches (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 - 3.06 inches (7.5 Threads per inch)
Outside diameter a male NPSH or NPT adapter - 2.84 inches (8 Threads per inch)

3" Hose Couplings

Most 3 inch hoses come with 2 1/2 inch couplings

4" Male Adapter

Inside diameter of a male adapter - 4" inches
Outside diameter of a male NH / NST adapter - 5.01 inches (4 Threads per inch)
Outside diameter a male NPSH or NPT adapter - 4.47 inches (8 Threads per inch)

5" Male Adapter

Inside diameter of a male adapter - 5" inches
Outside diameter of a male NH / NST adapter - 6.26 inches (4 Threads per inch)

6" Male Adapter

Inside diameter of a male adapter - 6" inches
Outside diameter of a male NH / NST adapter - 7.025 inches (4 Threads per inch)

Aluminum 1" NH Rocker Lug Cap

Garden Hose Thread Male Adapter

Outside diameter of a male GHT adapter - 1.06 inches (11.5 Threads per inch)

1" Male Adapter

Inside diameter of a male adapter - 1 inch
Outside diameter of a male NH / NST adapter - 1.375 inches (8 Threads per inch)
Outside diameter a male NPSH or NPT adapter - 1.295 inches (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 - 1.99 inches (9 Threads per inch)
Outside diameter a male NPSH or NPT adapter - 1.87 inches (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 inch
Outside diameter of a male NH / NST adapter - 2.51 inches (8 Threads per inch)
Outside diameter a male NPSH or NPT adapter - 2.35 inches (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 - 3.06 inches (7.5 Threads per inch)
Outside diameter a male NPSH or NPT adapter - 2.84 inches (8 Threads per inch)

3" Hose Couplings

Most 3 inch hoses come with 2 1/2 inch couplings

4" Male Adapter

Inside diameter of a male adapter - 4" inches
Outside diameter of a male NH / NST adapter - 5.01 inches (4 Threads per inch)
Outside diameter a male NPSH or NPT adapter - 4.47 inches (8 Threads per inch)

5" Male Adapter

Inside diameter of a male adapter - 5" inches
Outside diameter of a male NH / NST adapter - 6.26 inches (4 Threads per inch)

6" Male Adapter

Inside diameter of a male adapter - 6" inches
Outside diameter of a male NH / NST adapter - 7.025 inches (4 Threads per inch)

Brass Rocker Lug 1" NH Cap

Garden Hose Thread Male Adapter

Outside diameter of a male GHT adapter - 1.06 inches (11.5 Threads per inch)

1" Male Adapter

Inside diameter of a male adapter - 1 inch
Outside diameter of a male NH / NST adapter - 1.375 inches (8 Threads per inch)
Outside diameter a male NPSH or NPT adapter - 1.295 inches (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 - 1.99 inches (9 Threads per inch)
Outside diameter a male NPSH or NPT adapter - 1.87 inches (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 inch
Outside diameter of a male NH / NST adapter - 2.51 inches (8 Threads per inch)
Outside diameter a male NPSH or NPT adapter - 2.35 inches (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 - 3.06 inches (7.5 Threads per inch)
Outside diameter a male NPSH or NPT adapter - 2.84 inches (8 Threads per inch)

3" Hose Couplings