H2Flow FV-C-15 Flow Meter Check Valve Complete with Valve Body FlowVis provides a precise, easy-to-read flow rate Maximize energy savings by slowing the pump to its lowest required speed for pool sanitation No plumbing restrictions for precise flow measurement. Can be installed next to elbows, tees, etc. with littleor no degradation in performance. Can be installed in any position Consumes less plumbing space than individual Check Valve & Flow Meter combination