A pressure vessel for storing and supplying compressed air that functions as a stable power source for pneumatic systems. It temporarily stores compressed air from air compressors and provides stable supply to pneumatic equipment while buffering pressure fluctuations. Essential for continuous supply to manufacturing line automation equipment, air cylinders, and pneumatic tools, with capacity selectable from several liters to thousands of liters according to application. Standard equipped with pressure gauge, safety valve, and drain valve, featuring safety design compliant with JIS standards and PED directive. Also called receiver tank or air tank, clearly distinguished from other pneumatic equipment like pneumatic valves and air filters by its storage function.