Innokin iSub B Replacement 4ml Bubble Glass
The Innokin iSub B Replacement 4ml Bubble Glass is the perfect choice to increase the e-liquid capacity of the iSub B Tank. You can simply replace the original glass with the 4ml Bubble Glass which will double the capacity of e-liquid from 2ml to 4ml.
It is always a good idea to have a spare glass too, just incase you accidentally drop or damage the original glass tube.
1 x 4.5ml replacement glass for the iSub B Tank by Innokin