Flowvis Flow Meter, Retrofit Kit For Jandy Check Valve 2"-2.5", FVJ-R, GPM Go to amazon.com Related posts Top 9 recommendation flow viz for 2019 FeatureFlow Meter/Chk Vlv,FlowVis,Jandy/Praher Retro,2?s/2-1/2?spg DescriptionH2Flow