Our easy to use Flangeless Nut eliminates the need to flange tubing and is reusable. It is manufactured from Tefzel (ETFE) offering excellent solvent resistance. It has a 1/4-28 flat-bottom port configuration and is for 1/16OD Tubing. We offer it in a variety of colors to assist with differentiation in assemblies. Our nut comes in natural, blue, black, green, red and yellow.