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905.2.4 Pressure Reducing Devices
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Where the pressure at nozzles is more than 65 pounds per square inch (448 kN/m2), the 1 1/2-inch hose valve shall be provided with a device or disk to limit the force of the hose stream to 90 pounds (0.4 kN) so that the nozzle can be safely handled by one person.
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