Thank you for showing your interest in Airlife Blue Circuit 22mm Caps from Oxygen Equipment. The Airlife Blue Circuit 22mm Caps is a product of Cardinal Health and is thereby made of the highest quality. If you have any questions regarding Airlife Blue Circuit 22mm Caps or any product in Oxygen Equipment, please contact us. Our experienced personnel will answer any questions you have about Airlife Blue Circuit 22mm Caps. Also, if you are interested in purchasing large quantities of Airlife Blue Circuit 22mm Caps or any Oxygen Equipment, please contact Customer Service.