Whale In-Line Non-Return Valve [LV1219]Inline Non Return Valve COMPLETE YOUR BILGE SYSTEM Fit Whale high quality pumps and accessories to ensure long term reliability throughout your bilge system. Optimise your bilge pump's performance by preventing back flow. WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings. ca. gov.