vapwench: I'm sorry I didn't clarify what that was...it is as others have said, the CE2 R4 cartomizer with syringe tube mod so that you can see how much liquid is left in the chamber...as the internal diameter syringe tube is just some tenths or hundreds of a millimeter larger than the original CE2 metal tube, it helps with the wicking action...however, these babies are wonderful and provide good flavor, but not with every flavor out there, I noticed a few of my liquids prefer to be in the filler cartos rather than in CE2s...you just have to try it out yourself
but CE2s they are prone to leaking because they have a filler hole, it is not 100% airtight (not that bad, you'll keep them vertical at almost all the time and you'll get through with it)
if you like the filler cartos, you can get the regular 510 or the XL 510 cartomizers for the eGo...you can also do a similar mod using the syringe tube, i've done that too to avoid drying out my cartos...it helps me to know when i should drip in some liquid...they're not super hard to do but do take some learning curve, as for now i can easily complete one carto mod in under 5 mins...super easy once you get the hang of it
clearomizers? i don't even want to try it...you see the purpose of the syringe tube mod is not just to see how much liquid is left, but the main purpose of it is so that you can easily take the guts out from the syringe tube (trust me, it helps so much to clean this like i've describe in my earlier post) and put it back together and perform like new, syringe tube mod will prolong the life of your CE2...i'm positive that you can't take the clearomizer apart and put it back without having leakage problem