Simple really took some rubber "D" weather strip took screws out put the weather strip on the inner edge of ring and ran a bead of silicone around outer edge next to weather strip and reinstalled with scews. Then used same weather strip on lid edge to seal when closed. Since its rubber and non porous no worries with cleaning it. Then installed valve on lid for air lock hose that goes into bucket or to the c02 tank. Took about an hour to put whole thing together including racking port ect. I plan on putting casters on stand so i can role it around.