Comparison : Item # 1317-18-122B, 1/8" Tube O.D. (5/16-24 Thread) Compression Union Elbow Barstock Brass
Item # 1317-18-123, 3/16" Tube O.D. (3/8-24 Thread) Compression Union Elbow Brass
Item # 1317-18-124, 1/4" Tube O.D. (7/16-24 Thread) Compression Union Elbow Brass
Item # 1317-18-125, 5/16" Tube O.D. (1/2-24 Thread) Compression Union Elbow Brass
Item # 1317-18-126, 3/8" Tube O.D. (9/16-24 Thread) Compression Union Elbow Brass