holding appliance a device which may be used instead of tape to hold the tube in place sighting line b demonstrated in fig2 represents a visual contact of the tab for positioning and monitoring purposes according to this aspect of the invention additionally only the tab may be contemplated to space relate with the stationary reference means should the invention be applied to a tubular device having a non transparent wall in this case the tab could be adjusted a one inch distance or other suitable distance from where the endotracheal tube enters the intubated pathway or could be placed substantially adjacent to the entrance point where the device enters the intubated pathway the basic principles of the invention as demonstrated in the preferred embodiment give rise to variations equally within the scope thereof fig7 and 8 represent an alternative construction of both the marking insert and the wall of the endotracheal tube the marking insert 44 39 in this embodiment of the invention is substantially the same as the marking insert of the preferred embodiment the exception being in the formation of its tab specifically the tab 44 39 is of a uniform width and therefore not adapted for easy removal as in the preferred embodiment nor is it adapted to extend a substantial distance beyond the wall of the tubular member accordingly the tab 44 39 projects beyond the stem 38 39 only a relatively short distance so that when included to the secondary passage 26 39 of the endotracheal tube it resides substantially flush with the outer.