Hydrant Flow Tester Diffuser 4-1/2"NST 60PSI Gauge w/ Case
    Designed for 4" NST & 4-1/2" NST hydrant nozzles
    Measure flow rates up to 2800 gpm with consistent accuracy
    Screened diffuser protects adjacent property from water and stone damage

    Item: 12088
    Weight: 22.0 lbs
    Catalog Price: $1,695.95 

    This easy-to-use flowtester/diffuser provides consistent accuracy for large water flows. Each flowtester features a lightweight barrel with NST swivel fitting and diffuser. Barrels include a gauge and a replaceable pitot tube that is correctly positioned in the stream of water. Reading flow rate in gpm is as simple as reading gauge pressure and selecting the corresponding flow rate from the tables provided.

    The stream from a large hydrant outlet of 4 to 4-1/2" contains voids; meaning that the entire stream of water is not solid. For this reason, standard circular orifice flow formulas alone will not provide accurate results with 4 and 4-1/2" inch hydrant barrels. The table provided with each steamer nozzle flowtester/diffuser shows flow calculations and factory-recommended correction factors for hydrants with industry standard 0.90 nozzle coefficients.

    If you have hydrants with nozzle coefficients other than 0.90, we can provide custom tables at no charge; contact USABlueBook for more details.

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