Amazon.com: Pump Flow Switch, HT-120 AC220V 1A G3/4"-3/4" Thread Water Pump Flow Sensor Switch Used in the Domestic Tap Water Pressure in the Low Water Pressure Range : Industrial & Scientific
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Johnson Controls F61TB-9100 Liquid Flow Switch 1553.427 | eBay
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FS6200 Micro Flow Switch for High Temperature Gases. Adjustable Flow Switch.