For the rubber grommets, you might like to read this thread. http://www.e-cigarette-forum.com/forum/clearomizers/490677-possible-stinky-grommet-replacement.html
I've been using the silicon grommets and they do work better for me. Cheaper than buying the rubber grommets and able to withstand a higher temperature.
I've been using the silicon grommets and they do work better for me. Cheaper than buying the rubber grommets and able to withstand a higher temperature.