Model 1929-B Rat Gas Anesthesia Head Holder features a custom nose clamping device that can be utilized for delivering gas anesthesia. Gas is applied through a standard hose barb positioned above the nose on the mask. The inlet fills a large gas chamber around the snout, a second hose barb below the mask is provided for vacuuming off excess, expelled gasses. Design features include tooth bar. Palate bar option is available upon request.