If you have a hardtop on your Jeep, between the liftgate glass and the hardtop you should have a rubber seal. This seal can wear out over time or might be missing. Replace it with this OE factory direct fit unit from Omix-ADA. This piece of weatherstrip acts as a barrier to keep water, dirt, and noise out of your cabin. It also allows the glass liftgate to snuggly rest against the hardtop without any concern for damage or breaking the glass.