Are You using these for back flow, on Laterals ? I was using the conta coster B. F. P .valves for Years. I run these flush on grade . I saw that a plumbing Co. Has installed one of these inside a sewer concrete box below grade ! These B.F.P. are code on any sewer repairs in My county. I can.t believe an inspector would sign off one trapped in a concrete box. This was a major permitted remodel !One county wants these 12" above grade
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The amazing sewer popper