Small Animal Anesthesia Systems Safe, easy-to-use anesthesia systems for small animals Each system incorporates a patented breathing valve that controls gas flow to the nosecone and protects both animals and technicians from overexposure to gas. Switching from working with mice to rats is as easy as changing a nosecone. All systems, except the EZ 5000, come equipped with a heating system to maintain safe body temperature in the induction chambers and on surgical beds. The E-Z system is expandable to accommodate up to four breathers. The system is adaptable to a wide range of procedures from STEREOTAXIC, MRI, X-Ray, PET, simply by interchanging a breather.