Amerex Regulated Pressure Wheeled Fire Extinguishers feature a 110 cubic ft nitrogen cylinder, with a pressure regulator and either 16" semi-pneumatic rubber tires or 2 1/2" x 36" steel wheels. This traditional design allows for adequate pressure to ensure a smooth, complete discharge of the dry chemical, with pressure reserve for blowing down the discharge hose. Easy to transport and operate by one person. Models DDPAX469 and DDPAX472 are FM approved. USCG approved. Call the Sales Department for quantity pricing.