Between the canister end (21) and an end (22) of the closed sleeve, an adjustable abutment (23) is provided.

在所述罐体末端(21)和闭式套筒的末端(22)之间，设有可调支座(23)。

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A closed sleeve (20) is provided for abutment of the end (21) of the canister as the junction member is moved towards the canister.

设有闭式套筒(20)，当所述连接件移向罐体时该套筒用作所述罐体的末端(21)的支座。

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