The Cla-Val Series RF-DBI-IN Rubber-Flex™ Duckbill In-Line Style Check Valve is designed to be efficient, quiet and tough. It requires no external power sources, thereby reducing operating costs. The valve’s simple design means there are no moving mechanical parts to break down or jam, reducing maintenance costs. RF-DBI-IN Valves easily handle corrosive or abrasive materials such as raw sewage, sludges or slurries. Their flexible design allows solids to pass through unhindered and can even seal around solids trapped in the valve.