In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Backflow preventer with vent
I know many towns around here require the backflow to have a vent . But why ? You'd think the built in check in a pressure reducer and a ventless backflow would be more than enough on a typical residential boiler . After having one with a vent flood someones finished basement , I think all BFPs with a vent are an accident waiting to happen .