... bottle: Side views: If you need pump vacuum,please choose the water circulating vacuum pump at the same time:Characteristics: 1. The ... life;7. The system's sealing is very good, high vacuum, high evaporation rate, high return rate;8. The glass instrument ... , 30L, 50L Rotary Evaporator models for choice. RE-2000A CE & ISO Certificate Rotary Evaporator