Our Super Flangeless Nut is made from chemically resistant Dupont PFA. Our 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 1/32″OD Tubing. In comes in natural color as a single and in a 10 Pack. Brochure