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The only type of locking system for valve boxes are as follows:

For 10" round and rectangular valve boxes, a bolt can be purchased separately to bolt the lid shut. Upon request, the valve box comes with optional bolt threads to allow you to bolt the lid shut. This works very well.

The lids do not have a place to lock the lids shut using a conventional lock. However, the bolted down lid stops tampering very well.
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Many valve boxes come with bolting capabilities. I would use the bolt, it has worked very well for me on more commercial jobs because many kids and annoying teens like to screw up the valves.


Thanks
Ray
Rays Above and Beyond Automatic Lawn Sprinklers