The oil drain port of the China oil press press is usually installed at the bottom of the oil tank and located at the lowest point to facilitate the discharge of dirty oil and the cleaning of the oil tank.Specifically,the bottom of the fuel tank is usually designed as a sloping surface,and the oil discharge port of the oil press press is set at the lowest point of this sloping surface.In normal times,the oil drain port is plugged with a screw or a drain valve to prevent oil leakage.When it is necessary to change the oil or clean the fuel tank,you can open this drain port to discharge the dirty oil.