| http://www.w3.org/ns/prov#value | - Plunger 16 and piston 19 have slightly oversized side walls 21 which resiliently expand outward to form a 100% leak proof air tight hermetic seal within central passageway 13 and further act to seal off any leakage of suction or secretions out the valve 10 even if the valve 10 is left attached to a source of vacuum or suction such as leaving the valve connected to suction tubing.
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