Binhari liquid flow path (10) (11) and a gas flow path ( 12) and are formed independently, horizontal hole (11a) is opened to the outer peripheral surface of the bottle needle in communication with the liquid flow path. Cover (100) is provided with a substantially cylindrical shape and elastically compressed deformable peripheral wall (101), a head portion (150) provided on one end of the outer peripheral wall. In a state where the outer peripheral wall is not compressed and deformed, I block the lateral hole cover of the head is opened to the outer peripheral surface of the bottle needle. When the outer wall to displace the head against Binhari to compressive deformation, the bottle needle penetrates the head, the lateral hole and the gas passage is exposed from the head.瓶針(10)には液体流路(11)と気体流路(12)とが独立して形成されており、液体流路と連通した横孔(11a)が瓶針の外周面に開口している。カバー(100)は、略筒形状を有し且つ弾性的に圧縮変形可能な外周壁(101)と、外周壁の一端に設けられた頭部(150)とを備える。外周壁が圧縮変形していない状態において、カバーの頭部が瓶針の外周面に開口した横孔を塞ぐ。外周壁が圧縮変形するように瓶針に対して頭部を変位させると、瓶針が頭部を貫通し、横孔と気体流路とが頭部から露出する。
