You can use this water sensor with our crowtail mudules, because we reform the interface into crowtail compatiablely.Water flow sensor consists of magnetic core, rotating impeller, external casing and sensor and a hall-effect sensor. https://elecena.pl/product/7560151/crowtail-g1-water-flow-sensor-2-0 2017-02-01 https://elecena.pl/product/7560151/crowtail-g1-water-flow-sensor-2-0 2025-12-17