Dwyer Series FS-2 Vane Flow SwitchThe Series FS 2 Vane Flow Switches offers an economical flow proving solution. The FS 2 paddles are adjustable to fit 2. 5cm to 20cm size pipe. This user friendly switch offers a set point adjustment screw during field installation to allow for easy flow switch modification. Adjustable vane layers also provides customisable application set points, and hardy aluminum weatherproof housing permits for outdoor installation. Materials: Bellow Tin brass;