The ceramic Middle rod is made from a porous white glazed ceramic. A plastic ring created from polypropene sits below the tank. There is certainly an o-ring produced from a silica gel compound that can help seal the ceramic rod in to the plastic ring at The bottom from https://cheapvapecartsthc31738.blog-mall.com/27635878/the-best-side-of-buy-vape-carts-online-reviews