All they need is a section of threading that gets looser to release pressure while it is still retained in the top.
Thats all? What happens if the jar is turned upside down in this case? What if something is set on the lid? What if the jar is with someone heading to a camp site in a 4 wheeler and it is vibrated a lot?
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Thats all? What happens if the jar is turned upside down in this case? What if something is set on the lid? What if the jar is with someone heading to a camp site in a 4 wheeler and it is vibrated a lot?