Backflow prevention assembly. This requires permit and licensed plumber to install.
Missed one important thing
所有跟帖:
• 这个是干什么用的?sprinkler会有backflow吗? -落花起作回风舞- ♀ (0 bytes) () 06/02/2022 postreply 04:24:43
• Google 一下吧 -越王剑- ♂ (35 bytes) () 06/02/2022 postreply 05:27:45