Thank you for showing your interest in Oxygen Tubing Adapter from Oxygen Equipment. The Oxygen Tubing Adapter is a product of Hudson RCI and is thereby made of the highest quality. If you have any questions regarding Oxygen Tubing Adapter or any product in Oxygen Equipment, please contact us. Our experienced personnel will answer any questions you have about Oxygen Tubing Adapter. Also, if you are interested in purchasing large quantities of Oxygen Tubing Adapter or any Oxygen Equipment, please contact Customer Service.