问一下关于backflow valve。。。

whitelinen

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2009-04-14
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请问最近几年的新房子backflow valve一般都装在什么地方呢?想查看一下防患于未然。谢谢。
 
usually besides the water meter, located indisde a pipe which the diameter around 20cm.
 
Thanks LS. But how do I know it's properly installed?
 
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