LS tubing is a tubing that attached 40 μm diameter filter and luer tip type adaptor. When put through large amount of sample, this ideal for filtering samples or solvents being introduced into the SPE columns or cartridges. The length of this is 1 m. LS tubing 1, 6, 12 attaches cartridge connection adaptor (1 mL, 3 mL, 6 mL).