The 6" 375ASTBG Reduced Pressure Principle Backflow Assembly with grooved end butterfly valves with integral supervisory switches is utilized in high hazard applications for all applications and market segments, protecting against backsiphonage and backpressure of contaminated water into the potable water supply. The 375AST offers lightweight design with a high quality, 304L grade stainless steel valve body and sensing line, plus stainless steel internals, fasteners, and springs provide corrosion resistance and saves you money on maintenance costs.