This -6 check valve allows you to return the excess fuel to your tank as the motor reaches max rpm and the butterflies slam shut. Check valve is typically set at 20 to 200 pounds. Wrench hex is 13/16" on each end with a thirty seven degree flare to seal with all -6 AN hoses. Please specify Check Valve spring pressure in the box when ordering and if your not sure let RBS help you pick the spring pressure.
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