The typical optional components for selecting a filter include internal automatic drain, external automatic drain, pressure gauge, pressure differential gauge, electronic pressure differential indicator, and liquid level indicator.

The internal automatic drain and external automatic drain in the filter accessories are used to automatically discharge the mixture of oil, water, and dust filtered by the filter, reducing the impact of human factors on the filtering efficiency of the system. The pressure gauge, pressure meter, and electronic pressure differential indicator are used to guide the timing of replacing the filter element. The liquid level indicator is used to indicate the quantity of mixed pollutants, such as oil, water, and dust, inside the filter (it can monitor the working condition of the internal automatic drain and guide manual drainage by hand).