Flare Union 　 Part No. Ref. No. Description 402-04 04 1/4" O.D. Tube Both Ends 402-06 06 3/8" O.D. Tube Both Ends 402-08 08 1/2" O.D. Tube Both Ends 402-10 10 5/8" O.D. Tube Both Ends 402-12 12 3/4" O.D. Tube Both Ends