Industrial Air Contractor 041-0099IC H4X Remote Air Hub For use with any compressor with a 1/2-Inch quick connect port Remotely regulates air flow with the H4X and a 1/2-Inch diameter air hose Allows nail guns to recover 4 times faster than conventional systems that regulate air at the compressor 155 Max PSI maximizes your compressor power while roofing, framing , or trimming