Figure 42-14 Four types of commonly available endotracheal tubes. The cuffs are inflated with 10 mL of air. A, Microlaryngoscopy (MLT) tube (Mallinckrodt Co., St. Louis, MO) and extra-long, small-caliber (6.0-mm) polyvinyl chloride tube useful for laryngeal surgery. B, Standard intermediate pressure cuff and polyvinyl chloride tube (Mallinckrodt Co.). C, Armored "anode" tube with built-in spiral wire to minimize the opportunity of collapse or kinking. D, Flex-tip tube (Parker Medical, Englewood, CO) to facilitate insertion over a stylet or bougie. The numbers and letters visible on the tubes denote tube diameter, length from the tracheal end, and confirmation that the tubes have been tested for tissue compatibility (IT or Z-79).