The large seal is a thick rubber gasket for a shisha bowl.
There is no enjoyable shisha session without a perfectly airtight shisha. That’s why seals are an essential part of your hookah's proper functioning.
Remember, without a seal, there is no airtightness, and without perfect airtightness, you won’t get a significant amount of smoke!
When changing your coals and placing the used coals in your hookah’s ashtray, make sure not to burn the bowl seal. This will extend its lifespan and prevent giving your session a horrible rubber taste!