The utility model is composed of a tube body (1), a funnel-shaped outlet (4) and a funnel-shaped inlet (7). A spring (2) is buried in the wall of a tube body.
本实用新型是由管体(1)、漏斗形出口(4)、漏斗形入口(7)组成，管体壁内埋有弹簧(2)。
The utility model is composed of a tube body (1), a funnel-shaped outlet (4) and a funnel-shaped inlet (7). A spring (2) is buried in the wall of a tube body.
本实用新型是由管体(1)、漏斗形出口(4)、漏斗形入口(7)组成，管体壁内埋有弹簧(2)。
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