Aqua One Main Seal O Ring For Advance 550 and Advance 750

A new main sealing ring to fit The Aqua One Advance 550 and Aqua One Advance 750 external canister filters. The sealing ring or O Ring fits around the base of the motor unit and forms a comression seal between the top and bottom parts of the filter. Over time these become less ‘springy’ and leaks can easily occur.