Japanese Chemical Spray Tank, 85 litre
There is no description of these spray tanks found in sources reviewed. However, one references cites a similarity to the American E6R9 spray tank. This tank has a filling capacity of 83.27 liters (22 gallons) with a poppet-type vent and a continuous discharge mechanism. It was operated by means of a spring mechanism released by a solenoid attached to the aircraft.
Nothing else to see.