Knox Box Standpipe Lock 3" Female NH/NST Locking Cap Model:4047 (6.0 TPI x 3.623 OD) There is an optional heavy

There is an optional heavy duty 2 inch strap with swivel spring clip that clips onto (2) 1/4" chisel-steel attachment loops

you probably need this plug

Global type "F" aluminum 1 1/2 inch male camlock (Cam & Groove) coupler to 1 1/2 inch male NPT threads

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) There is an optional heavyThe 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