GLASS COLUMNS WITH FRITTED DISC AND PTFE STOPCOCK PLUG Gravity chromatography column manufactured from medium wall tubing with 821000 PTFE stopcock Similar in design to the 420530 series 40-60 micron porosity glass frit at the lower end to act as a support for column packing material Custom sizes and plastic safety coating are available upon request Replacement stopcock plug is 821001 Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements Column ID (mm) : 19 Column Length (mm) : 250 Nominal Column Volume (mL) : 56 Plug Size (mm) : 2 Case Qty : 1