An anal dilator No. 5 is a medical device used for rectal and anal dilation as part of a therapeutic or post-surgical care plan. It is part of a set of graduated sizes designed to gradually widen the anal canal and rectum, typically under the guidance of a healthcare professional.

Treating anal strictures or stenosis (narrowing of the anal canal), which can be caused by scar tissue from surgery, inflammation (e.g., from Crohn's disease), or radiation therapy for pelvic cancer.

Relieving symptoms of anal fissures and hemorrhoids by helping to relax the internal and external anal sphincter muscles, which reduces spasms, pressure, and pain, and improves blood flow for healing.

Post-surgical care to prevent the formation of scar tissue and maintain the normal function and size of the anus after procedures like hemorrhoidectomy or surgery for an imperforate anus.