Comparison : Item # 61-8-4, 1/4" O.D. Tube Plated Compression Supply Fitting - Standard Nut - Plated
Item # 61-8-6, 3/8" O.D. Tube Plated Compression Supply Fitting - Standard Nut - Plated
Item # 61-8-8, 1/2" O.D. Tube Plated Compression Supply Fitting - Standard Nut - Plated
Item # 61-8-10, 5/8" O.D. Tube Plated Compression Supply Fitting - Standard Nut - Plated