Compressor Intake Air Filter 1/2" NPT Metal filter Housing with paper filter Replacement Part # HL018200AV NPT or National Pipe Thread is measured by the inside diameter of pipe , not the outside of the threads. For: Campbell Hausfeld , Husky, Sears and others. Please allow slight manual measurement deviation for the data. Designed for single cylinder units. Has a Pleated Element Ability to mount vertically, horizontally. Tubular silencing design If you are unsure if this is the correct filter, please send us your model & serial number and we will be happy to help.