The ceramic center rod is comprised of a porous white glazed ceramic. A plastic ring made out of polypropene sits underneath the tank. There may be an o-ring created from a silica gel compound that assists seal the ceramic rod into your plastic ring at The bottom of your https://buyvapecarts420review62481.fitnell.com/67577248/edibles-marijuana-candy-things-to-know-before-you-buy