Backflow prevention assembly. This requires permit and licensed plumber to install.
Missed one important thing
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这个是干什么用的?sprinkler会有backflow吗?
-落花起作回风舞-
♀
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06/02/2022 postreply
04:24:43
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Google 一下吧
-越王剑-
♂
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06/02/2022 postreply
05:27:45