Blue-White Industries F-30400P Flow Meter, Blue-White, F-300, for 4" PVC, 75-420GPM F-300 Series Flowmeter by Blue-White Industries Blue-White has re-engineered the classic F-300 series flowmeter to make it even more accurate, reduce space requirements for installation, and to provide enhanced features without changing the iconic look of this Industry favorite – including the red cap! Features: Installs quickly Determine Circulation System flow rate in seconds One piece machined acrylic meter body – polished to a clear finish Easy to read, high resolution dual scale, permanently printed Read flow from either side of the meter body Ships complete with gasket seal and mounting clamps