| http://www.w3.org/ns/prov#value | - Note however, that should the pressure in the container 10 quickly drop a significant amount, such as due to a leak, the pressure in the chamber 46 will force the piston 40 against the plug 34 (or the folded down neck 32c), thereby sealing the high pressure gas in the chamber 38 by the upper O-ring 42.
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