Facemask with supply and exhaust ports for AnesthesiaFeatures Facemask with supply and exhaust ports Anatomically correct design for a tight fit for mice and rats Zero Leakage Zero Dead Space Ports swivel 360 Optically clear Designed to provide access to eyes and head of the rodent Mask provides stability of the animal for examinations and surgery Does not include Swivel Ports Options Order code Facemask Size OC SFM Small OC MFM Medium OC LFM Large OC XLFM Extra Large Gas anesthesia with Isoflurane is