A range of rubber stoppers / bungs with either one 3mm hole (for sizes 5 to 8mm base diameter) or one 5mm hole (for all other sizes), ideal for a tube to pass through. The numbers in the description denote the base/upper stopper diameter in mm - e.g. 3/4.5mm. ;The Shore hardness of these bungs is A45-A55.
MIN (-50c) to MAX (+70c)