Abstract: In order to solve the problems associated with the dangers and hazards related to compressed oxygen cylinders, the Safe-T-Ox Cart was invented. The Safe-T-Ox Cart consists of a saddle device which hinges on the main body of the Safe-T-Ox Cart. The saddle device consists of two parts. The first, an anterior positioned retainer device, designed to fit snugly around the narrowing top portion of the oxygen cylinder. The second, a posterior positioned keyed locking area, designed to lock the retainer device into position. The purpose of the saddle device is to secure the oxygen cylinder within the Safe-T-Ox Cart, thus preventing unauthorized removal of the oxygen cylinder.