1/4" Stainless Steel Swivel Nut and Barbed Stem.
These are needed to connect MFL Quick Disconnect Couplers to hoses. Also used for Gas Distribution blocks, Manifolds, Regulators, and other equipment. 1/4" Flare Nut with 1/4" Stem is the "standard" size for most all applications.
NOTE: This Flare nut uses Nylon Flare Washer # 04E4291 whenever there is metal on metal connection. You may not need them with Quick Disconnect fittings due to the plastic of the QD, but using Flare Washers insures NO LEAKS.