Our 3L high efficiency flasks with Bi-Directional Transfer Cap specifically designed to support high viability and protein expression in mammalian and insect cells This advanced flask significantly enhances the utilization efficiency of shakers improving cell survival rates and ensuring reproducible test results With consistent cell growth and yield from batch to batch this flask is an essential tool for any laboratory focused on cell culture and protein production Optimized for high-density cell culture the High Efficiency Erlenmeyer Flask ensures exceptional performance and reliability Pre-installed with a bi-directional transfer cap this flask allows for closed liquid transfer minimizing the risk of external contamination during capping and screwing The innovative design features a large filter membrane and high oxygen flux eliminating the need for an external air filter This enhances the oxygen supply promoting robust cell growth and increasing the utilization rate of shakers