AAS Inverted Flare Steel Line Nut 121006 (Pack of 10) 3/8" Tube 5/8"-18 Thread 10 pcs of 3/8" Inverted Flare Steel Line Nut 5/8"-18 Thread Great For Steel Line Coils Equivalent to 105E, 121006, 105X6, 90005 For 3/8" Tubing