Dwyer Instruments SFI-300SS-3/4 sight flow indicator 3/4 in 4.063 in

Sight Flow Indicator for 3/4 in NPT Lines

The Dwyer Instruments SFI-300SS-3/4 is a window sight flow indicator built for 3/4 inch FNPT connections. Its 316 stainless steel body and tempered glass windows suit industrial fluid monitoring where corrosion resistance is required. The rotor-style impeller provides visual confirmation of flow in horizontal or vertical orientations. Operators handling water, oils, or compatible chemicals at moderate pressures will find it fit for purpose.

Replaces Opaque Pipe Sections or Basic Gauges

Install this indicator when a process needs direct visual verification that fluid is moving through a 3/4 inch line. The jump from a solid pipe or pressure-only gauge is worth it when flow interruption, air pockets, or pump priming issues must be spotted immediately. It handles media temperatures from 32 to 200 degrees F and pressures up to 125 psig. Systems running hotter, higher-pressure, or abrasive media need a different rating.

Threaded Install with Two Window Faces

The unit threads onto standard 3/4 inch FNPT fittings and measures 4.063 inches in overall length. Two opposing 2-inch tempered glass windows give a clear view of the rotor from multiple angles. Buna-N seals handle the stated temperature and pressure range. Common issues include rotor fouling from dirty fluids, seal degradation outside the 32 to 200 degree F window, and glass damage from thermal shock or impact. Ensure flow direction matches one of the four rated orientations.