9L Water Base Stored Pressure Type Fire Extinguisher are a type of fire extinguisher that uses water as the primary extinguishing agent. Water-based extinguishers are particularly useful in environments where these materials are prevalent, such as offices, schools, and residential buildings. These extinguishers are commonly used for combating Class A fires, which involve ordinary combustibles such as wood, paper, cloth, and plastics. 9L Water Base Stored Pressure Type Fire Extinguisher typically use a stored pressure design, meaning that both the water and the compressed air (or nitrogen) needed to expel the water are stored within the same container.