Anti-Syphon valves are required by various fire protection codes to be installed in fuel oil systems to prevent syphoning oil out of a tank due to a low line break or leak in the pipe. The Anti-Syphon Valve is installed in a vertical position at the highest point in the suction line with no part of the line between the valve and the tank below the maximum oil storage level. Although suitable for outdoor installation, consideration should be given to the possibility that moisture en trained in...