T&S Brass B-0970-FE Back-Flow Presenter The T & S B-07970-FE Backflow preventer is designed for continuous pressure use. The design prevents back siphonage and back flow of water. 3/8" NPT female inlet and outlet and finished with chrome plating.Atmospheric Back Flow Preventer 3/8" IPS... MSRP: $113.90 Now: $68.38 Add to Cart Compare Compare Selected