Viair 92951 1/8" Male NPT to 1/4" Compression Fitting for 1/4" Air Line Fitting made from Brass 1/8 inch Male to 1/4 ID Air hose compression fitting Pneumatic fitting used to connect an air line to your onboard air system. NPT fittings are thicker at the base and should not be overtightened. Use thread sealant for proper installation. Teflon tape is not recommended.