After many trials with tape, glue and miscellaneous anesthesia circuit adapters to effectively attach bottles modified as anesthesia masks for our long- faced friends (I'm looking at you Mr. Hornbill) to small animal breathing circuits, we knew there had to be a better way. Introducing the bottle adapter that makes this easy! We have developed an adapter that will simply screw onto the existing neck of a soda bottle and attach directly to a small animal anesthesia circuit.