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Liquid Flow Meter - Plastic 1/2 NPS Threaded : ID 828 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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0.1-0.5GPM Water Liquid Flow Meter Tool Flowmeter Water Liquid Inline Flowmeter Rotameter Adjustable Knob Panel Type, Female Thread 1/4" BSPT: Amazon.com: Industrial & Scientific
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Polysulfone In-Line Flow Meter with Polysulfone Connection - Water, 2" GPM/LPM or GPH/LPH Scales, No Valve
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uxcell G3/4" Hall Effect Liquid Water Flow Sensor Switch Flowmeter Counter Meter DC 5V 2-45L/min SEN-HZ43WB: Amazon.com: Industrial & Scientific
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1" Socket PVC TKS Series Digital In-Line Paddle Wheel Flow Meter with Relay & Pulse | U.S. Plastic Corp.
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