The passage through which biopsy, haemostasis and foreign-body retrieval instruments travel into the body via the endoscope channel. Of all endoscope parts, this is where friction and durability are felt most directly in the hand.
Bore, length and layer structure are built to drawing. In the same category, see the Endoscope Insertion Tube and Bending Rubber as well.
Dimensions, material, application. Those three are enough to start. A drawing makes it faster. We reply with TDS, MSDS and MOQ together.