Non-refillable dosing capillary insert

A capillary insert for administering liquid products comprising:

• a cone which has in its upper part a hole for the administration of liquids through an internal channel, the cone having a frusto-conical configuration ending in a washer that divides the cone;
• and
• a skirt that extends axially from the washer in a direction opposite to the cone,
• wherein the insert has one or more non-homogeneous breaking zones comprising one or more thin sections of thickness and one or more thick sections of thickness around the perimeter of the capillary insert, and
• wherein each thin section of thickness is thinner than each thick section of thickness, which breaking zones when exerting an external force or subjected to an external force allow the total or partial breaking of the insert.