Comparison : Item # A455-4, 1/4" O.D. Tube S.A.E. Flare Fitting-Assembled with Short Rod Nut - Cross Union
Item # A455-5, 5/16" O.D. Tube S.A.E. Flare Fitting-Assembled with Short Rod Nut - Cross Union
Item # A455-6, 3/8" O.D. Tube S.A.E. Flare Fitting-Assembled with Short Rod Nut - Cross Union
Item # A455-8, 1/2" O.D. Tube S.A.E. Flare Fitting-Assembled with Short Rod Nut - Cross Union
Item # A455-10, 5/8" O.D. Tube S.A.E. Flare Fitting-Assembled with Short Rod Nut - Cross Union