This water flow switch is a simple relay control to turn a device on or off if water is flowing or not. Has telephone jack style connector (modular jack), 1/4" quick-connect fittings, 36” cable, measures 0.7” in diameter and 2.5” in length. Minimum activating flow rate is 0.08 gals/min. Max pressure 150 psi. Wetted surfaces are polycarbonate. CE marked.