| http://www.w3.org/ns/prov#value | - The capillary or gas-flow'retardation tube 62 has a length of about 18 inches and an internal diameter of about 0.035 inches to impart proper retardation to the gas, such as carbon dioxide, flowing downward from the quick-disconnect gas coupling 40 so that it does not except at too high a speed and pressure from the minute pores of the diffuser 60.
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