Replacement Air Intake Filter Assembly for Ingersoll Rand 54406640. Carbon Steel Construction for Indoor or Outdoor Use. 3/4" Male NPT thread. Please Note 3/4" MNPT Measures 1.05 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 25 SCFM.