Using mine with bottom cap, with extension tank part on top ( female/female tank part ) with clear window on top, then top cap then final small cap, 510 Atty set up inside, with drip tip on top, no atty sleeve at all. I find this to be the best set up with NO leaking, no flooding, just vape away tank after tank, no atty sleeve/mouthpiece opening and closing, just vape away tank after tank with this set up, I find it much better then the big 510 Atty mode by far. If you happen to get a dryer hit just loosen the very top cap or even leave lose and tighten when done vaping. People should really try this out.