Stainless Steel Inverted Flare Tube Nuts, Fits 5/16 in. Tubing, 1/2 in.-20 Thread, 5/16 in. I.D., Set of 2|JEGS Stainless Steel Inverted Flare Tube Nuts for 5/16 in. Tubing [1/2 in.-20 Thread].
JEGS 106382 Tube Nuts -6 AN Fits 3/8 in. Hard Line with Tube Sleeve Steel Set of
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JEGS 635812 NiCopp Tube Nuts
Inverted Flare Steel Tube Nuts For 3/8 " Tube, 5/8"-18 Threads (Pack of 4)