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Cadmium plated escutcheon
Service test pressure
Carbon Steel 4" Flange x 2 1/2" Female NH
If you have any doubt it is best to contact your local fire department for size and thread type in your area
Residential Use
Aluminum 2 1/2" Female NH to 3" Male NH Inlet Threads_NH / NST Cadmium plated escutcheonNote 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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