Comparison : Item # 1317-20-308, 1/8" Tube O.D. (5/16-24 Thread) x 1/8" MPT Flareless Male Run Tee Brass
Item # 1317-20-309, 3/16" Tube O.D. (3/8-24 Thread) x 1/8" MPT Flareless Male Run Tee Brass
Item # 1317-20-310, 1/4" Tube O.D. (3/8-24 Thread) x 1/8" MPT Flareless Male Run Tee Brass
Item # 1317-20-311, 1/4" Tube O.D. (3/8-24 Thread) x 1/4" MPT Flareless Male Run Tee Brass
Item # 1317-20-312, 5/16" Tube O.D. (7/16-24 Thread) x 1/8" MPT Flareless Male Run Tee Brass