Transfer Cap System

Optimum Growth™ Flasks (patented) in conjunction with the Transfer Cap System eliminates the need to move cells to an intermediate transfer for scale up or seed cultures. The ability to pump into the Optimum Growth™ Flask (patented) makes filling with media from a bulk source a simple aseptic method. The Transfer Cap in conjunction with the Thomson Optimum Growth™ Flask (patented) product line can be used for reagent addition, seeding of larger bioreactors or cell bags, pumping of media into flasks from large drums or bags of media, and other liquid media transfers into and out of bioreactors.

The Optimum Growth™ Flasks come in multiple sizes of 125mL, 250mL, 500mL, 1.6L, 2.8L and our popular 5L.


Inversion Transfer Cap

The Sterile Inversion Transfer Caps (patented), allow for the simple aseptic transfer of media or cells to cell bags, bioreactors, or flasks (from all manufacturers). The Inversion Transfer Cap works with the 1.6L and 5L Thomson Optimum Growth™ Flasks (patented). Simply, replace the culture cap with the Transfer Cap and connect to your vessel of choice.

How to Transfer

To transfer, invert the Optimum Growth™ Flask and let gravity do the rest. The Optimum Growth™ Flask and Transfer Cap System eliminates the need to transfer cells to an intermediate flask for scale up. Inversion or gravity feed has the lowest shear force of any transfer method available.

The Inversion Transfer Cap in conjunction with the 1.6L and 5L Thomson Optimum Growth™ Flasks (patented) product line can be used for reagent addition, seeding of larger bioreactors cell bags, or other liquid media transfers.

Connection Options

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Bidirectional Transfer Cap

The Sterile Optimum Growth™ Bidirectional Transfer Caps (patented) with downstem, allow for easy aseptic transfer of media or cells into and/or out of cell bags, bioreactors, and flasks (from all manufacturers).

The Bidirectional Transfer Cap with downstem works with the 1.6L and 5L Thomson Optimum Growth™ Flasks (patented) and your peristaltic pump. Simply, replace the culture cap with the Transfer Cap and connect to your vessel of choice.

How to Transfer or Feed

  1. Replace with Bidirectional Transfer Cap
  2. Connect to your receiving vessel by Tube Fusing or using our Luer Lock option
  3. Place the silicone tubing in the peristaltic pump head
  4. Liquid can then be pumped either into or out of the flask

Connection Options

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Find Your Transfer Cap Here

Type (inversion or bidirectional) & Size

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Choose a Connection Type

Part # Type Title Flask Connection
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Optimum Growth™ Inversion Transfer Cap Part Numbers

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Optimum Growth™ Bidirectional Transfer Cap Part Numbers

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Optimum Growth™ Transfer Cap Accessory Part Numbers

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