For concentration of materials in volatile solvents. Combines rapidity, simplicity and quantitative efficiency including minimization of entrainment escape and transfer losses. Available in 250ml, 500ml, 1L flasks, with a 19/22 inner joint on bottom of flask, 24/40 on top. Choice of Snyder or Vigreux column. Supplied with springs (8030) or Delrin clamps (7598). Graduated receiver available with or without glass hooks.