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Cast Iron Valve/Square Wrench?

Acetylene tanks use square head valves of this sort. The "keep upright" portion would apply to the tank, rather than the wrench, as the fuel is dissolved in a matrix (sponge-like) of acetone....
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Cast Iron Valve/Square Wrench?

The label reading "KEEP UPRIGHT" implies that it's not a tool, but part of a valve or other mechanical component. Quarter-turn ball valves have similar handles. My guess is that the valve ...
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