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National Stock Number (NSN 4210-01-080-1458)
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
If you have any doubt it is best to contact your local fire department for size and thread type in your area
Carbon Steel 4" Flange x 2 1/2" Female NH
Residential Use
Aluminum 2 1/2" Female NH to 3" Male NH Inlet Threads_NH / NST National Stock Number (NSN 4210-01-080-1458)Note 3 inch NH NST is very rare and is often confused with 2. 5 inch NH NST which is very common. If you have a fire department connection (FDC), hose coupling or an adapter check the female coupling for stamped numbers and letters. Most 3. 0 inch hoses use 2. 5 inch NH NST couplings. The most common fire fitting thread in the United States is 2 1 2 inch NH NST. If you have two swivel female FDC brass connections that need plugs measure the INSIDE
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