Brass 1 1/2" Female NH to 3" Male NH (Hex) Inlet Threads_NH / NST They are usually labeled FDC

They are usually labeled FDC (Fire Department Connection) and/or AUTO SPKR (Automatic Sprinkler)

Coast Guard and other Military branches

One end opens so hose may be pulled out for an easy hose lay

The amount of hose the wrapper will secure depends upon the size

Carbon Steel 6" Flange x 4 1/2" Male NH

Brass 1 1/2" Female NH to 3" Male NH (Hex) Inlet Threads_NH / NST They are usually labeled FDCFemale to male adapters are used to bridge male to female hoses, pipes or valve fittings. Brass is commonly chosen for corrosion resistance, and is popular with chemical or salt water applications. Equivalent part number FM15F30F WARNING: This product contains a chemical known to the State of California to cause birth defects or other reproductive harm. Do not use in connection with drinking water. Wash hands after handling. Brass Female to Male