There are actually two models of VV3. The one that takes the "pen cap" (I forget it's name, but it's a subtle difference if there's any difference at all!) is 510 only. The other model is 510 and ego.
And yes, with the pen cap model a 510 to ego adapter is needed for ego threaded toppers.
Thank you for that info. I was actually asking about the smok epipe based on an avatar photo, but always good to know for the next I taste vv that I buy.
Sent from my Nexus 7 using Tapatalk