Replacement Carbon Steel Air Intake Filter Assembly for Ingersoll Rand 32170953. Carbon Steel Construction for Indoor or Outdoor Use. 1" Male NPT thread. Please Note 1" MNPT Measures 1.315 Outisde Thread Diameter in Linear Inches. Enclosure Dimensions 4.0" Height x 6.0" Diameter. Polyester Filter Element Included with Integrated Gasket Seal. Can be Mounted Vertically or Horizontally. Rated for Up to 35 SCFM.