Amerex’s DIRECT PRESSURE WHEELED FIRE EXTINGUISHERS utilize a 23 cu ft nitrogen cylinder on 125 and 150 lb units and a 55 cu ft nitrogen cylinder on 300 and 350 lb units, with a “quick opening valve” to pressurize and completely discharge the agent cylinder. The 125 and 150 lb units have 16" semi-pneumatic tires. The 300 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. USCG approved.