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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 is water tight; is made of through hardened stainless steel and is guaranteed not to rust.
In this particular application, a standard length Meterguard barrel lock does not pull itself tightly against the valve's ears and is therefore free to rotate within the recess.
To clamp the housing tightly against the valve's ears, a special length barrel lock could be supplied.
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