Comparison : Item # 1317-20-317, 1/8" Tube O.D. (5/16-24 Thread) x 1/8" MPT Flareless Male Branch Tee Brass
Item # 1317-20-318, 3/16" Tube O.D. (3/8-24 Thread) x 1/8" MPT Flareless Male Branch Tee Brass
Item # 1317-20-319, 1/4" Tube O.D. (3/8-24 Thread) x 1/8" MPT Flareless Male Branch Tee Brass
Item # 1317-20-320, 1/4" Tube O.D. (3/8-24 Thread) x 1/4" MPT Flareless Male Branch Tee Brass
Item # 1317-20-321, 5/16" Tube O.D. (7/16-24 Thread) x 1/8" MPT Flareless Male Branch Tee Brass