IDEX Super Flangeless Nut is made from chemically resistant Teflon™ PFA resin. IDEX nut is excellent for those connections that need to be broken frequently and tubing assemblies because they swage onto the tubing. This nut has a 1/4-28 Flat-Bottom port configuration and is for 1/16 or 1/32OD Tubing. In comes in natural color as a single and in a 10 Pack.