The Hiross 120Q is a precision compressed air filter from the Italian brand Hiross. It's a post-processing purification accessory for air compressors, its core function being to filter impurities, liquids, and oil from compressed air.
"20" represents the model specification, corresponding to a flow rate of 12 cubic meters per minute. "Q" represents the filtration precision level: it can filter out large amounts of liquid and condensates as small as 3 microns, with a maximum residual oil content of 5 ppmw/w.