Koolance's inline flow switch provides a simple electronic confirmation of coolant flow. The switch will close if the flow rate stays above 2.0LPM / 0.53GPM (+/-10%), and opens when below. Fitting threads are G 1/4 BSPP, and the primary materials are stainless steel and nickel-plated brass. Wire length is about 28" (70cm). It is recommended to keep current through the flow switch at 10mA or less to prevent damage.