Our easy to use Flangeless Nut eliminates the need to flange tubing and is reusable. Manufactured from Polypropylene it is excellent for use with aqueous solutions. Our nut has a 1/4-28 flat-bottom port configuration, is for 1/16OD Tubing and comes in a variety of colors to assist with differentiation in assemblies. Our nut comes in natural, blue, black, green, orange, red and yellow.