The perfect tool kit to fill your cartomizers, clearomizers and tanks! The Needle tip bottle cap replaces the cap and dripping tip of our current bottles making it a perfect tool for those who like to use cartomizers, clearomizers and tanks. It also works great for dripping on atomizers and will reduce the amount of excess liquid that sometimes clings to the side of the atomizer drip-tip. To install, simply remove the existing cap and the dropper from your existing bottle of VOLCANO eLiquid and screw on the needle tip cap for easy cartomizer filling! Genius.