Vaporizers Sevoflurane Quick-Fil and Maquet Filling mix oxygen and sevoflurane for anesthesia. This sevoflurane may degrade to toxic hydrogen fluoride.

http://www.fda.gov/medical-devices/medical-device-recalls/vaporizer-recall-getinge-removes-vaporizer-sevoflurane-quick-fil-and-expands-recall-vaporizer