Comparison : Item # A42-2, 1/8" O.D. Tube S.A.E. Flare Fitting-Assembled with Short Rod Nut - Straight Union
Item # A42-3, 3/16" O.D. Tube S.A.E. Flare Fitting-Assembled with Short Rod Nut - Straight Union
Item # A42-4, 1/4" O.D. Tube S.A.E. Flare Fitting-Assembled with Short Rod Nut - Straight Union
Item # A42-5, 5/16" O.D. Tube S.A.E. Flare Fitting-Assembled with Short Rod Nut - Straight Union
Item # A42-6, 3/8" O.D. Tube S.A.E. Flare Fitting-Assembled with Short Rod Nut - Straight Union