... pipelines of backflow safety device HS41X-16A anti-fouling off valve (pipe backflow prevention device) is used to prevent ... drinking water. HS41X-16A secure antifouling off valve is added between the two valve composed of a drainage device. Drainage ... from the valve, diaphragm valve cover, valve, seal plate, valve, valve seats, springs and other components. HS41X-16 common antifouling cut off valve for ...