Misc Vendor FV-C 0FlowVis Flow Meter/Check Valve by H2Flow: FlowVis is the most advanced, affordable, and reliable precision flow meter designed specifically for pools, spas, fountains, and water features. But FlowVis is more than just a flow meter it’s also a fully functioning check valve! Ingenious in concept and flawless in operation, FlowVis is a revolution in reliable flow measurement. Unlike other flow meters, the position in which FlowVis is installed (horizontal, vertical or relative to elbows and tees), has zero effect on its accuracy. Combined flow meter and check valve – no calibration required Installation flexibility. No plumbing restrictions for precise flow measurement. Install next to elbows, tees, etc. with little or no degradation in performance Clear, easy to read scale in GPM or optional LPM with key velocity points (FPS) NSF Certified to 50 psi Manufactured in the USA. Schedule 40 CPVC 5 year breakage warranty Available in 3" and 4" Schedule 80 PVC versions Built to last. There are no saddle clamps to corrode, flat rubber seals to deteriorate, or small holes to become blocked. Available as a retrofit for an existing Jandy or Praher valve 26-042-1004