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waterboard keys


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I think waterboard keys are used to open and close underground valves/stop cocks.

They are usually made of carbon steel which will rust and the diameter tends to be on the light side. (10mm)

The listening rods where a different tool that was used to locate leaks underground.

They had a round cup which was placed near your ear and an extendable rod that was placed on the ground.

 

You might get better results with a 16mm stainless rod 1000mm long and weld a "T" at one end.

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