The duplex part combined by 397 filter air relief value, 396 oil atomizer.It has the function such as filter, pressure reduction, lubrication etc.The common filter accuracy:50-75u m.Pressure regulative range:0.05-1.0MPa.Special indication should be made for order of 5-10u m, 10-20u m, 25-40u m filter accuracies, 0.05-0.3MPa, 0.05-1.6MPa, 0.05-1.6MPa regulative range.Please refer to filter, air relief value, oil atomizer product description for further information of thesize and performance.