Replacement Inner Cannula for D.I.C.® trach tubes. Trach tubes are designed with a disposable inner cannula which facilitates both patient care and helps reduce the possibility of post-procedural infection. Designed as a one-piece outer tube, the 15mm ISO termination is a permanent part of the tube. Built-in 15 mm ISO termination for easy ventilator circuit attachment with or without inner cannula in place. Inner diameter: 6mm, 60/case.