This CellSTACK® polystyrene culture chamber with a vent cap is functionally superior to any similar working product. It has two 26mm diameter filling ports allow direct access to chamber bottom providing greater flexibility for sterile filling and emptying by pouring, pipetting or via tubing in a fully closed system. Standard 33mm threaded caps have 0.2µm pore nonwettable membranes sealed directly to the caps to allow gas exchange while minimizing the risk of contamination. Optional 33mm threaded caps are available with integrally sealed chemically resistant, heat sealable flexible tubing to allow direct sterile transfer of media and cells. USP Class VI Polystyrene provides excellent optical clarity and mechanical strength. Sterilized by gamma radiation and certified nonpyrogenic. 100% leak tested prior to shipping. Sterile. Material: Polystyrene. Number Of Chambers: 40. Cell Growth Area: 25440cm2. Recommended Medium Volume: 5000 to 7600mL. Flask Shape: Rectangular. Neck Style: Short. Surface Treatment: TC-Treated. Graduations: Yes. Cap Style: Vented. Cap Diameter: 33mm. Cap Material: High Density Polyethylene. Cap Color: Orange. Corning® #: 3272.