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Meter Seals

Barrel Locks & Keys

Water Locking Devices

General Purpose Locks

Cap Lock Assembly

Secures Male Pipe Threads from Unauthorized Access


The Cap Lock Assembly is a heavy duty steel locking assembly designed to secure male pipe threads from unauthorized access. The internal threaded cap meets NPT standards for pipe. The outer body is contoured and designed to freely rotate around the inner body thwarting efforts to unscrew the device. Special design features prevent moisture or glue from seeping between the inner and outer bodies effectively thwarting tampering attempts. Cap Locks are available in thread sizes from 1/2" to 1-1/2".

Cap Lock Assembly


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Features and Benefits


• Heavy duty carbon steel construction
• Case hardened components resist cutting with hacksaws and other tools
• Threaded cap meets NPT standards
• Available in multiple sizes to fit 1/2" to 1-1/2" pipe
• Available with optional sealing provision
• Available with your choice of standard length barrel lock
• Specially plated for corrosion resistance

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Additional Cap Lock Assembly Images

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The Cap Lock Assembly is an ideal solution for securing exposed male pipe threads.

The Outer Body turns freely preventing the device from being unscrewed.

Optional sealing provisions offer a durable, permanent means to enhance security.

Cap Lock Installed

Free Turning Outer Body

Optional Sealing Provisions