IDEX easy to use Short Flangeless Nut eliminate the need to flange tubing and is reusable. Made from solvent resistant Tefzel (ETFE) it is ideal for use where there are demanding sealing applications. It has a 1/4-28 flat-bottom port configuration, is for 1/16 tubing OD and comes in a variety of colors to assist with differentiation in assemblies. We offer IDEX nut in blue, black, green, red and in natural color and a 10 pack of natural color.