The end cap's unique internal geometry allows it to be infinitely adjusted and tightened against the valve's stem before locking the barrel lock in place. The taper on the end cap discourages the use of prying tools and effectively deflects blows from blunt tools. The cap is made of thru-hardened stainless steel and is guaranteed not to rust.

The head of Meterguard's barrel lock is short enough to lie completely within a shallow recess such as this. The tapered head cannot be gripped with pliers, and it will not break off.
Meterguard's barrel lock generates a unique clamping force of over 60 lbs and produces a tight, tamper proof installation when used on valves like this.
Meterguard's barrel lock is water tight; is made of thru-hardened stainless steel and is guaranteed not to rust.

For more information and photos on how well the "O" rings and stainless steel perform in the "real world", click on Environmental Test.