Darley offers its own Flow Test Kit with several outstanding design features that make it easier to use than kits offered by others. Precise flow measurement accurately measures flows from 160-1500 gpm within 30-200 psi pitot gauge range. Reliable conversion table-flow results based on standard flow charts and proven with extensive water volume tests. Liquid-filled dial gauge 3-1/2" diameter, Grade A-1% accuracy, 0-200 psi range and vibration free readings. Tester body nozzles and swivel inlet are made of heat-treated aluminum alloy. Parts are hard-coated anodized to provide an extremely durable, protective surface. Automatic coupling design for instant and positive nozzle bore change. Renewable Brass Pitot Blade allows easy, inexpensive pitot blade replacement. Ship. wt. 18 lbs.