Wotofo Easy Fill Squonk Caps – Simply screw the cap onto the top of your 60ml short fill bottle. Then remove the top cap to reveal the 510 threading. Next, screw your bottle with cap attached into the 510 threading of your squonk mod. Then turn the device upside down and squeeze the squonk bottle, which will pull e-liquid into the chamber. Unscrew your bottle and your ready to go!