No more having to insert a leaking cartridge, or sliding tanks up & down trying to fill. No more atomizers & cartridges either. The Vision CE4 long-wick tank is very simple to use. Just unscrew the tip and fill or re-fill with your favorite flavor. And the long wick in the CE4 assures you that all your liquid will be used. Check out the Vision CE4 kits on sale now, too!