Assura Colotip Easy to use Soft and flexible stoma cone with tubing for use with Assura irrigation set. Irrigation creates security and freedom for people with a sigmoid colostomy, enabling a regular, controlled bowel movement. Soft and flexible stoma cone with tubing for use with Assura irrigation set. After irrigating, an Assura Stoma Cap is recommended. Irrigation should not be self-administered before you have been fully instructed by a doctor or nurse.