Comparison : Item # 1317-10-117, 5/16" Tube O.D. (1/2-20 Thread) x 1/4" Tube O.D. (7/16-20 Thread) Reducing Flare Union SAE 45 Degree Flare Brass
Item # 1317-10-118, 3/8" Tube O.D. (5/8-18 Thread) x 1/4" Tube O.D. (7/16-20 Thread) Reducing Flare Union SAE 45 Degree Flare Brass
Item # 1317-10-119, 3/8" Tube O.D. (5/8-18 Thread) x 5/16" Tube O.D. (1/2-20 Thread) Reducing Flare Union SAE 45 Degree Flare Brass
Item # 1317-10-120, 1/2" Tube O.D. (3/4-16 Thread) x 1/4" Tube O.D. (7/16-20 Thread) Reducing Flare Union SAE 45 Degree Flare Brass
Item # 1317-10-121, 1/2" Tube O.D. (3/4-16 Thread) x 3/8" Tube O.D. (5/8-18 Thread) Reducing Flare Union SAE 45 Degree Flare Brass