Knox Box Standpipe Lock 3" Female NH/NST Locking Cap Model:4047 (6.0 TPI x 3.623 OD) The female threaded side of

The female threaded side of this adapter will only connect to a 3 inch male British Standard Pipe (BSP) Thread

one Spring #2

you probably need this plug

The male threaded side of this adapter will only connect to a 1 inch female National Pipe Tapered (NPT) thread

What is the cap made of and how durable is it

Knox Box Standpipe Lock 3" Female NH/NST Locking Cap Model:4047 (6.0 TPI x 3.623 OD) The female threaded side ofThe Knox Standpipe Lock protects standpipes, fire and wall hydrants from accidental damage, vandalism, and physical attack. Since the Knox Standpipe Lock holds water pressure, it can be installed on hydrants. The Knox Standpipe Lock is available for 2. 5 connections with varying thread options and is operated with a Knox FDC Wrench controlled by the Fire Department. Protects dry and wet standpipe outlets in stairwells from vandalism Reduces