Brass 3" NH Plug (Pin Lug) Outlet Threads_NH / NST Square heads up to 1

Square heads up to 1 1/4 inch

75% lead-free

male coupling on top

Intended use is to fully open or close water flow

Brass 3" NH Plug (Pin Lug) Outlet Threads_NH / NST Square heads up to 1If 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),