The H2Flow FlowVis flow meter and check valve is designed for compatible plumbing applications where flow monitoring and one-way flow protection are needed together. A combined flow meter and check valve is useful because it helps display flow rate while also helping prevent reverse flow through the line.This replacement is especially useful when the original assembly is leaking, sticking, inaccurate, damaged, or no longer performing correctly. Matching the correct 2 inch to 2-1/2 inch spigot configuration with safety flapper helps preserve intended fit and dependable operation.The FV-C-S is a practical service part when a compatible plumbing system needs a combined flow meter and check valve to restore dependable performance. H2Flow FlowVis flow meter and check valve 2 inch to 2-1/2 inch spigot configuration Includes safety flapper Useful when the original assembly is leaking, sticking, or inaccurate Supports cleaner and more dependable monitoring and flow control