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The Check Valve can be installed in horizontal piping runs or vertical piping runs with the flow running upward. IMPORTANT NOTE: This Check. Valve is not Allow the actuator shaft to move until it stops. Check valve diverter position*, if the position is correct flip the toggle switch in the opposite direction and Inspect check valve operation through clear cover. If necessary, disassemble valve and inspect o-ring and valve body for damage. Thoroughly grease. FOR YOUR SAFETY - This product must be installed and serviced by a professional technician, qualified in pool/spa installation. Improper installation and/or WARNING - Read and follow all instructions in this owner's manual and on the Do not change filter control valve position while system pump is running.