Column Hardware

Supelco modular columns contain the following markings:
4.6 mm I.D. = 3/8" OD Tubing with 2 lines
4.0 mm I.D. = 3/8" OD Tubing with no lines
3.0 mm I.D. = 3/8" OD Tubing with 1 line
2.1 mm I.D. = 1/4" OD Tubing with 2 lines
Supelco frit assemblies are color-coded as follows:
Gray = 2.0 μm pores
Black = 0.5 μm pores