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The glass is hand-blown borosilicate glass, this is a LEAD-FREE, thicker more resilient glass.
The submarine inside is made out of glass, each one is intricately handcrafted by our master artisans.
The spigot is adjustable, there is a silver ring on the threaded part of the spigot towards the back, if you twist this ring the seal will compress allowing it to fit snuggly within the glass. It doesn't need to be forced in, as you twist it and play with the fit you can test it with water to make sure the seal is perfect.
The spigot is made out of stainless steel. The seal between the glass and the spigot is adjustable to ensure a seal for life.