The Zlide Tank is compatible with all Z-line coils. The mouth-piece must first be removed allowing the user to then slide back the tank and re-fill, a nice child-proof design. With the mouth piece back in place, the cap is now locked closed. The Zlide tank is normally found on the Adept Zlide kit but would make a great addition for any user who would like to own a more solid tank, helping to prevent breakages if dropped. Click Here For Coils