24/40 top outer
Improved by the addition of two drain holes close to the base of the inner tube to allow solvent to drain back into the evaporator flask.
For use with a rotary evaporator trap and a standard laboratory vial. Adapter has a standard ground glass outer joint at the top and a 20-400 G.P.I, threaded connection at the bottom. The bottom thread allows for direct access to any vial.