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This filter tube is similar to the AF-0544 series, but has two sidearms with stopcocks, permitting its use with regular flasks or Schlenk flasks. This model is equipped with 2 mm glass stopcocks with constant pressure retention devices as shown. The inner standard taper joints are the same on both sides. Available in your choice of 14/20 or 24/40 joints, coarse or medium porosity and 20, 30 or 40 mm diameter.