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Amazon.com: Water Flow Sensor Switch with 1/2-inch Interface Electromagnetic Flowmeter Industrial Accessory Water Flow Measuring Device for Water Heater : Patio, Lawn & Garden
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YF-S201 Hall Effect Water Flow Meter Sensor - ElectroPeak
1/2 Inch Digital Water Meter Total Water Flow Counter Meter + Brass Flow Sensor B7 Electronic Water Meter - Buy Plastic Body Water Meter,Digital Electronic Water Meter,Liquid Water Flow Counter Meter Product
1/2" - 3" Variable Area Vane-Style Flowmeter for 10 - 160 GPM Water (MN) | Universal Flow Monitors