Used for multiple recrystallization of extremely air sensitive compounds. A solid crystallized in one arm may be recrystallized in a closed system by decanting the supernatant liquid into the other arm and vacuum distilling the solvent back into the crystals in the first arm. This process may be repeated as often as necessary. After removal of the final supernatant liquid, dried crystals may be transferred to a Schlenk Tube. With four 14/20 outer joints and porosity B (70-100m) fritted disc. Approximate volume in each arm is 75mL.