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you create a way for water to get in. Beside it is not a solid plug of rubber. There is an inner wedges or something to that effect which force the plug to expand as you turn the T handle.

if someone is dead set on making the tube be open... there is not much you can do. All these lockable cap kinda things or a locking box they are re-located to sit in are just deterrents.

another one https://www.cherneind.com/products/cherne-monitor-well-1454141528

@serpico760 https://www.atlanticsupply.com/product/locking-plug-1-25-1-14-orange-locking-well-plugs-for-monitor-wells-t25-well-plug-torquer-style/ they make several sizes. Just pulled this link to show the product. use's small padlock. Though this is made for test point on wells. Not sure...

@serpico760 Rubber plug. How hard would it be to cut the cross off the top and weld or epoxy an upside down 1/4 socket to it? Make it a 10mm. For once it won't be lost. Unusable..... but not lost. @ramdough spreadsheet has some locking fuel cap stuff in it.