The requirement in accordance with MIL-P-116 that Method IId (rigid metal containers) have a water vaporproof seal is well understood. What is not well understood is that simply closing the container may, in fact, not assure an effective seal. This outdoor test study describes a simple, inexpensive valve to test and assure a hermetic seal or, through the use of a new 'question mark' shaped type of gasket, be reasonably certain that a seal was obtained without testing. (Author)
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