As the hatch slowly closes, the weight rises inside a section of PVC pipe.

随着出口板缓慢合上，一截PV c管内的重量也增加。

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Attach the PVC pipe on the top of bottle and put it on the aquarium.

将座脚放在瓶子上面，后倒置在鱼缸玻璃片上。

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Attach the PVC pipe on the top of bottle and put it on the aquarium.

将座脚放在瓶子上面，后倒置在鱼缸玻璃片上。

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