... Circulation pipe 循环管 Cock screw 紧定螺钉 column pipe 柱状套管 ...
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pallet cock screw 叉夹板螺钉
balance cock screw 摆夹板螺丝
brass screw down bib cock 黄铜水龙头
screw cock 螺塞
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Designed to prevent the flow of contaminated water back into the potable water supply, these devices require no plumbing changes, and screw directly onto a sill cock.
其功能在于防止污染水回流到饮用水供应系统中，这些装置不需要对改变管线，只需要直接螺纹旋在洒水龙头上即可。
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