| http://www.w3.org/ns/prov#value | - the tube member while communicating with the through hole; and a cap threadedly coupled to the thread of the cap coupling portion in the body, the cap including a cap body, an opening identification skirt provided at a lower end of the cap body and engaged with the skirt engagement member of the body, an annular groove formed at an inner surface of a top wall of the cap body, the annular groove be
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