Abstract: A device for containing a volatile anesthetic and an anesthetic agent delivery system. The device may include a bottle closure, which may be attached to an anesthetic bottle until it is time for the anesthetic to be transferred to a vaporizer. A membrane may be used to seal the opening in order to prevent the anesthetic from leaving the reservoir until it is desired to fill the vaporizer. In order to protect the membrane a cap and a cap support may be placed on the reservoir so as to cover the membrane. The container may further include a connecting surface on the cap support or the reservoir, the connecting surface being connectable to a vaporizer. The system includes a vaporizer having a side slotted tube needle that is able to pierce the membrane and through which the liquid anesthetic agent and/or vapor may pass from the reservoir to the vaporizer. A method for transferring a liquid anesthetic from a container to a vaporizer.