Amerex Direct Pressure Wheeled Fire Extinguishers utilize a 23 cubic ft nitrogen cylinder on 125 lb and 150 lb units, and a 55 cubic ft nitrogen cylinder on 300 lb and 350 lb units, with a “quick opening valve” to pressurize and completely discharge the agent cylinder. The 125 lb and 150 lb units have 16" semi-pneumatic tires. The 300 lb and 350 lb units have 6" x 36" steel wheels. Both allow for easy maneuvering and operation by one person. All units fitted with a 4" stainless steel fill opening and brass cap for easy servicing. Models DDPAX452 and DDPAX493 are FM approved. USCG approved. Call the Sales Department for quantity pricing.