Aqua one Main head O-Ring Seal to suit Aquis CF1000 and CF1200

A new main sealing ring to fit the Aqua One Nautilus 600/800 and Aquis 500/700/550/750 external canister filters. The sealing ring or O Ring fits around the base of the motor unit and forms a compression seal between the top and bottom parts of the filter. Over time these become less 'springy' and leaks can easily occur.