Rotary Evaporator Bump Traps is used between the vapor tube and evaporation flask on a rotary evaporator to prevent contents of the flask from being drawn into the condenser in the event of bumping.

Modified bump traps provide expanded volume for reactions that have a tendency to foam excessively. The inner vapor tube is sealed to the top of the trap to prevent entry into the condenser. Traps with drain holes feature two 4mm holes at the base of the inner tube to allow solvent to drain back into the evaporation flask.