Liquid Flow Meter - Plastic 1/2 NPS Threaded : ID 828 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Liquid Flow Meter - Brass 1/2 Nominal Threaded : ID 833 : $24.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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uxcell s14070200am8595 1/2" PT Thread 0.05-0.5GPM 0.2-2LMP Water Liquid Flow Meter Flowmeter: Science Lab Flowmeters: Amazon.com: Industrial & Scientific