The H2Flow FlowVis flow meter and check valve is designed for compatible Schedule 40 valve-body applications where both flow monitoring and one-way flow control are needed. A combined flow meter and check valve is useful because it helps display flow rate while also helping prevent reverse flow through the plumbing line.This replacement is especially useful when the original assembly is leaking, sticking, inaccurate, damaged, or no longer operating correctly. Matching the correct SCH40 valve-body design helps preserve intended fit and dependable system performance.The FV-2 is a practical service part when a compatible plumbing system needs a combined flow meter and check valve to restore dependable flow monitoring and check-valve protection. H2Flow FlowVis flow meter and check valve Designed for compatible SCH40 valve-body applications Combines flow visibility with one-way flow control Useful when the original assembly is leaking, sticking, or inaccurate Supports cleaner and more dependable plumbing performance