These commercial stored pressure extinguishers are available in a choice of two sizes and three chemical options. The carriage design on both sizes provides cage type protection for the agent cylinder as well as a well balanced platform for transportation and operation. The narrow width and easy rolling semi-pneumatic rubber tire wheels allow one person movement through narrow aisles, doorways and in confined areas. Chemical and pressure are sealed in the agent cylinder, ready for instant actuation and are always protected from contamination. Stored pressure wheeled extinguishers are less expensive to purchase as well as easier and less costly to maintain and service.