MS21921-2 Nut, Sleeve Coupling, Flareless is a carbon steel flareless tube-nut designed for 1/8 in. outer-diameter tubing, part of the MS21921 family of sleeve-coupling fittings. This product is sold as a 10-pack and is intended for 1/8 in. tube O.D. MS21921 flareless sleeve-coupling assemblies. The MS21921-2 designation identifies the 1/8 in. size variant within the standard flareless sleeve-coupling nuts, and the carbon steel construction provides the robust build expected of MS21921 parts for non-flared tube connections without forming a flare on the tube.
