Until recently, Item 74531 Spray Work Basic Airbrush could only be used with items 74515 HG Air Compressor Revo and 74520 Spray-Work Basic Air Compressor w/Airbrush. But this new connector joint converts the screw thread size to PF-1/8-28 (Type S), now making it possible to be used with Item 74533 Spray-Work Compact Air Compressor or other makers' air compressors.