Our Flangeless Nut is easy to use, eliminates the need to flange tubing and is reusable. It's biocompatible PEEK construction ensures good pressure holding ability and long-term durability. It has a 1/4-24 thread port configuration and is for a 1/8OD tubing. It comes variety of colors for your convenience. Our nut comes in natural, blue, black, green, orange, Red, natural - 10 Pack and yellow.