SKP regulator operates between 0-150 supply and 0-125 PSI operating pressure. Part # TQ-SAR400-NO6 Go to our web site to see our other compressor parts. http://airbosscompressors.blogspot.com We also have in stock, rebuild kits and parts for Air Boss and Techquip air compressors. Air line filters, regulators , in-tank check valves, safety valves , auto moisture drains , electronic time auto drains