Dwyer Instruments SFI-300SS-3/4 sight flow indicator 3/4 in 4.063 in
A 316 stainless steel sight flow indicator with dual tempered-glass windows and a rotor for visual flow confirmation in 3/4 in FNPT lines rated to 125 psig and 32 to 200 °F
- Main materialHAWA
- 316 stainless steel body resists corrosion
- Tempered glass windows withstand 125 psig pressure
- Rotor indicator shows flow direction instantly
- Operates from 32 °F to 200 °F media temperature
- Buna-N seals suit water and oil applications
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.
How it compares
Measured against everything we stock in Garden Hoses & Pipe Tubing, at today’s prices. Recalculated every night.
- Price $381.99
- Pricier than about 91% of the 973 comparable items (median $21.99).
Specifications
| Product | |
|---|---|
| Brand name | DWYER INSTRUMENTS |
| Size & build | |
| Main material | HAWA |
Questions about this item
What pipe size and thread type does the 3/4 in body use?
The indicator has a 3/4 in FNPT connection on each end for direct threading onto matching pipe.
How should the rotor be oriented during installation?
Mount the body so flow runs in one of the four marked directions — horizontal left, horizontal right, vertical up or vertical down — and ensure the rotor spins freely.
When should the Buna-N seals be inspected or replaced?
Check the seals if leakage appears or after prolonged exposure near the 200 °F media-temperature limit; Buna-N degrades faster at sustained high heat.
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