| 摘要 |
It comprises a protection assembly comprising two latches mounted on a shutter and two mortises, each latch having a catch and, when the shutter is in an obturating position, being able to assume an operating position in which its catch is engaged in a respective one of said mortises such that said latch fixes the shutter, each latch having a maneuvering portion adapted to cooperate with the edge of said spout of appropriate diameter for said latch to be driven to a withdrawn position by said spout when it meets a maneuvering portion during a thrusting movement into the end piece, the maneuvering portion of each latch being separated from the maneuvering portion of the other latch by a free space having a length smaller than said appropriate diameter and greater than an inappropriate spout diameter.
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