Vacuum Trap, 500mL Capacity, Fits 1900mL Dewar Flask, 310mm OAH x 130mm Width, Complete. Trap is designed for large volume solvent removal by vacuum. The 40/35 standard taper joint connects trap body with stopper. Connections are 1/2in O.D. Trap is designed to fit into standard CG-1593 through CG-1595 Dewar flasks.