OPW Sight Flow Indicator or also called as Sight glass for connecting Nozzle and Hose Pipe With One Year Manufacturer's Warranty.OPW Sight Flow Indicator are designed with different sizes of nozzles in mind.
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A sight flow indicator provides a view of liquid flow and flow direction. Simple and low-cost, it also allows operators to observe the color, clarity, consistency, viscosity and other characteristics of petrol and diesel.