UP100 Barbed 0.28 inch / 7.3mm Swivel Nut Set for MFL 1/4" Ball Lock Pin Lock Home Brew Fitting 3 Pack 0.28 inch / 7.3mm OD barbed 1/4" FFL nut(female flare) is compatible with 1/4"MFL fitting found on ball lock and pin lock disconnects and regulator bodies and gas manifolds. Material: Stainless Steel Package content: 3 sets nut