Brass 3" NH Plug (Pin Lug) Hose Size (ID)_2 1/2" Hoses If you have a fire

If you have a fire department connection (FDC)

Carbon Steel 4" Flange x 6" Male NH

5" NH / NST

Thermoplastic 2 1/2 inch NH / NST threaded cap with chain

If possible it is best to measure the MALE fitting

Brass 3" NH Plug (Pin Lug) Hose Size (ID)_2 1/2" Hoses If you have a fireIf your FDC or female swivel connection is approx. 3 1 2 inch inside diameter, you need this plug. If your FDC is approx. 3 inches, you need 2 1 2 inch plug which is the most common in the US. Please contact your local fire department. Safety Notes Not intended for pressure applications for protection only 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),