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PCV, PCV can be screwed together, glued or just fit together without a leak, most, when storing or protecting something/anything from moisture they drag out all the stuff sold in cans and bottles.
Back to PCV, add fittings, get a vacuum pump, put the PCV together, vacuum out the atmosphere inside the container then close the valve, no atmosphere, no moisture.
Or heat the container, fill the container with hot air from a hair dryer then seal the container.
Pistols: Heat an ammo can, pad the pistol, place in the hot ammo can and close the lid. The heat removes the atmosphere by expanding the air inside, when the air inside cools a vacuum is formed, outside atmospheric pressure will seal the can.
Or continue purchasing stuff in a can or bottle.
Inert gas that is heavier than air has been used to store food in 55 gal barrels for years, lids are used but most do not spend a lot of time sealing the top, tilting the container defeats the purpose.
F. Guffey
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