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For 1/4-28 and 5/16-24 UNF PortsCompression fittings designed for liquid-tight connection of semi-rigid tubing to fl at-bottom 1/4-28 and 5/16-24 port threads, for tubing diameters 1/16” to 3/16” OD. Each connection is comprised of a two-piece nut and ferrule system, useful for pressurized applications under 500 psi. Make a selection based on your tubing outside diameter (OD); fittings are color-coded by tubing size for easy identification. These bottom-sealing UNF fittings do not require PTFE tape. Part numbers ending “X” denote a pack of 10 fittings.