It's either a Kanger EVOD or a chinese knockoff of a Kanger EVOD. O rings can be lost when cleaning. The wicks in the
coils can break down and cause leaking. I started replacing the top (flavor) wicks with a double strand of cotton yarn after dry burning them. That solve a lot of gurgling and leaking problems. New bases can be found for a buck or 2 each and come with new o rings. That about covers all the possible leak issues I know of. Good luck
ETA Use Kanger replacement
coils for the best results. The cheapies are notorious for leaking and poor firing.