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。
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。
PE water supply pipe with a traditional steel pipe, PVC water pipe text ethylene products.
给水用PE管材是传统的钢铁管材、聚氯文字乙烯饮用水管的换代产品。
PE water supply pipe with a traditional steel pipe, PVC water pipe text ethylene products.
给水用PE管材是传统的钢铁管材、聚氯文字乙烯饮用水管的换代产品。
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