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Part#: 40054
Weight: 24.0 lbs

Hydrant Flowtester/Diffuser w/ Case‚ 4.5" NST‚ 160-PSI Gauge‚ No Elbow

  • Designed for 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
Price: $1,695.95
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Need Help? Call 800-548-1234

This easy-to-use flow Tester/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 4-1/2" hydrant outlet 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 4-1/2" hydrant barrels. The table provided with each flow tester/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 information.

Kits Include: Hard-coated aluminum barrel with 4-1/2" NST swivel fitting and diffuser‚ Replaceable pitot tube‚ 4" 160 psi liquid-filled gauge with quick disconnect connection (±1% accuracy)‚ Heavy mesh diffuser screen and Hard carrying case.