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Do not dismiss your dream. The water flow sensor is applied for water heater, and can be used as flow switch. Three wire connection: Red for positive, black for negative, yellow for pulse signal. Working range: 1-30L/min.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.