I noticed this in the product description - "Our EGO-T kit is not compatible with the KGO, EGO, or 510 products. This version of the EGO-T is a modified design to prevent the leaking problems seen by the standard EGO-T designs." I don't know what they've changed as the tanks look identical to Joye tanks, maybe the threads are different? Anyway, the fact that it's not compatible with eGo or 510 parts would be a real showstopper for me.