Tubing diameter for a 3.9mm column

[JFrancis]

Hi there. Just wondering what would be the optimum connector tubing diameter when using a 3.9mm, 15cm 5um particle size waters column? Mobile phase used is generally predominantly ACN with tetrahydrofuran. Any ideas?? Thanks

[tom jupille]

0.010" id or 0.007" id

Keep the length as short as possible.

This is the same general requirement for any 3 - 5 mm id column (e.g., 3.2, 3.9, 4.0, 4.6 mm id).