| 摘要 |
A gas-containing apparatus includes a can, a bag and a cover. The bag is installed in the can. The bag includes a tube formed thereon and with an internal side and an external side, a thread formed on the external side of the tube and a boss formed on the external side of the tube. The cover is mounted on the can. The cover includes a valve with an external side and an internal side, a thread formed on the internal side of the valve for engagement with the thread of the bag and a recess defined in the valve for receiving the boss, thus avoiding rotation of the tube relative to the valve.
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