Manufacturer: Niikura Kogyo  Co., Ltd
Model: NC No.44 Series:  44RC-80, 44RS-100 to 300

Function

The bottom or top-side ballast tank of a bulk carrier or ore carrier houses this device.
During operation, when the ballast tank is full, the water level in the tank rises above the waterline. Consequently, the ballast discharges naturally by gravity.