Brass 1 1/2" NH to 1 1/2" NPT Double Male (Hex) Hose Size (ID)_1" Hoses both constructed of 2" nylon

both constructed of 2" nylon webbing

It's usually installed on the inlet side (Suction Side) of a water pump to keep it from losing it's prime during the off cycle

Back flush flap is drawn closed during suction operation

thread and couplings in use by fire departments today is double jacket hose with aluminum NH / NST

High pressure 1 1/2 inch brass combination nozzle with full rubberized bumper has the option of a straight stream or fog pattern and simple twist shutoff

Brass 1 1/2" NH to 1 1/2" NPT Double Male (Hex) Hose Size (ID)_1" Hoses both constructed of 2" nylonMale 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. Compatible part number DMH1515F 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 Male to Male Adapter