Horse Veterinary Questions? Ask an Equine Vet.
Greetings: Apologies for the delay in responding to your question. Are you referring to outside or inside diameter? Permanent equine tracheotomy tubes come in two general sizes: First is one with an outside diameter of 22mm, inside diameter of 18mm, second is one with a 28mm outside diameter and an inside diameter of 22mm. I hope this answers your question, but please let me know if you need any more information.Many thanks,-Dan C., DVM.
Did you have any further questions? Happy to help!-Thanks again,-Dan C., DVM