Barrel Bung (Butress Thread)
thingiverse
This was tailored to fit snugly within the 55-gallon plastic drums' threaded hole. To ensure a secure seal, the original plugs featured a gasket, but for my application on a floating dock, I opted to use silicone as an alternative gasket material since it would never need to be removed. The wrench required for installation or removal of the plugs can be found in the thing files.
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