Transfer Caps
Eliminates intermediate vessels for scale up & seed cultures

Thomson Transfer Caps
Simple Aseptic Connections
Thomson Transfer Caps when used in conjunction with Optimum Growth® Flasks (patented) eliminates the need to move cells to an intermediate vessel for scale up or seed cultures. The ability to pump into the Optimum Growth® Flask makes filling with media from a bulk source a simple aseptic process. Transfer Caps in conjunction with the Thomson Optimum Growth® Flasks 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.
Transfer Caps are compatible with the following Optimum Growth®Flasks 1.6L, 2.8L and our popular 5L.

Inversion Transfer Caps
utilize gravity feed for the simple aseptic transfer of media or cells
Optimum Growth® Inversion Transfer Caps (patented) utilize gravity feed for the simple aseptic transfer of media or suspension cells to cell bags, bioreactors or flasks (from all manufacturers). Specific Inversion Transfer Caps are designed to work with 1.6L, 2.8L and 5L Thomson Optimum Growth® Flasks. Simply replace the vented flask cap included with each flask with the correct Inversion Transfer Cap and connect to your vessel of choice.

How to Transfer
Specific Inversion Transfer Caps in conjunction with 1.6L, 2.8L or 5L Thomson Optimum Growth® Flasks can be used for reagent addition, seeding of larger bioreactors cell bags, or other liquid media transfers

Connection Options




Visit More of the Optimum Growth® System
Bidirectional Transfer Caps
utilize a peristaltic pump for easy aseptic transfer of media or cells
Optimum Growth® Bidirectional Transfer Caps (patented) with downstem, utilize a peristaltic pump for easy aseptic transfer of media or cells into and/or out of cell bags, bioreactors, and flasks (from all manufacturers).
Specific Bidirectional Transfer Caps work with the 1.6L, 2.8L and 5L Thomson Optimum Growth® Flasks (patented) and your peristaltic pump. Simply replace the vented cap included with each flask with the appropriate Transfer Cap and connect to your vessel of choice.

How to Transfer or Feed
- In the hood replace the flask vent cap with the correctly sized Bidirectional Transfer Cap
- Connect to your receiving vessel by either Tube Fusing or using an available Luer Lock option
- Place the silicone tubing in the peristaltic pump head
- Liquid can then be pumped either into or out of the flask

Connection Options


Need Help Choosing the Right Transfer Cap?
Part # | Type | Description | Flask | Connection Type |
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Optimum Growth® Inversion Transfer Cap Part Numbers
- Inversion Transfer Cap for Optimum Growth® 1.6 & 2.8L Flasksterile7/16" O.D. Male Quick Connect | SterileUse with Stand & Ring (931609)pn931706-4|4/caseclick for more details
- Inversion Transfer Cap for Optimum Growth® 1.6 & 2.8L Flasksterile2' of C-Flex® 16 (O.D. 1/4") w/ Plug | SterileUse with Stand & Ring (931609)pn931705-4|4/caseclick for more details
- Inversion Transfer Cap for Optimum Growth® 1.6 & 2.8L Flasksterile2' of C-Flex® 24 (O.D. 7/16") w/ Plug | SterileUse with Stand & Ring (931609)pn931708-4|4/caseclick for more details
- Inversion Transfer Cap for Optimum Growth® 1.6 & 2.8L Flasksterile2' of C-Flex® 16 (O.D. 1/4") w/ Male Luer Lock | SterileUse with Stand & Ring (931609)pn931710-4|4/caseclick for more details
- Inversion Transfer Cap for Optimum Growth® 5L Flasksterile1/4" O.D. Barbed Quick Connect | SterileUse with Stand & Ring (931606)pn931594-4|4/caseclick for more details
- Inversion Transfer Cap for Optimum Growth® 5L Flasksterile7/16" O.D. Male Quick Connect | SterileUse with Stand & Ring (931606)pn931596-4|4/caseclick for more details
- Inversion Transfer Cap for Optimum Growth® 5L Flasksterile2' of C-Flex® 16 (O.D. 1/4") w/ Plug | SterileUse with Stand & Ring (931606)pn931595-4|4/caseclick for more details
- Inversion Transfer Cap for Optimum Growth® 5L Flasksterile2' of C-Flex® 24 (O.D. 7/16") w/ Plug | SterileUse with Stand & Ring (931606)pn931598-4|4/caseclick for more details
- Inversion Transfer Cap for Optimum Growth® 5L Flasksterile2' of C-Flex® 16 (O.D. 1/4") w/ Male Luer Lock | SterileUse with Stand & Ring (931606)pn931616-4|4/caseclick for more details
Optimum Growth® BiDirectional Transfer Cap Part Numbers
- Bidirectional Transfer Cap for Optimum Growth® 1.6L Flasksterile2' of C-Flex® 16 (O.D. 1/4") w/ Plug | SterileUse with Peristaltic Pumppn931704-8|8/caseclick for more details
- Bidirectional Transfer Cap for Optimum Growth® 1.6L Flasksterile2' of C-Flex® 16 (O.D. 1/4") w/ Male Luer Lock | SterileUse with Peristaltic Pumppn931702-8|8/caseclick for more details
- Bidirectional Transfer Cap for Optimum Growth® 2.8L Flasksterile2' of C-Flex® 16 (O.D. 1/4") w/ Male Luer Lock | SterileUse with Peristaltic Pumppn931804-8|8/caseclick for more details
- Bidirectional Transfer Cap for Optimum Growth® 5L Flasksterile2' of C-Flex® 16 (O.D. 1/4") w/ Plug | SterileUse with Peristaltic Pumppn931614-8|8/caseclick for more details
- Bidirectional Transfer Cap for Optimum Growth® 5L Flasksterile2' of C-Flex® 16 (O.D. 1/4") w/ Male Luer Lock | SterileUse with Peristaltic Pumppn931618-8|8/caseclick for more details
Transfer Cap Ring & Stand Part Numbers
- Stand with Ring for Inverting Optimum Growth® 1.6 & 2.8L Flasksnon-sterileUse with 1.6 & 2.8L Inversion Transfer CapsStand Height 22"pn931609|1/caseclick for more details
- Stand with Ring for Inverting Optimum Growth® 5L Flasknon-sterileUse with 5L Inversion Transfer CapsStand Height 22"pn931606|1/caseclick for more details
Transfer Cap Ring Only Part Numbers
- Ring Only for Inverting Optimum Growth® 1.6 & 2.8L Flasksnon-sterileUse with 1.6 & 2.8L Inversion Transfer CapsRequires 22" Standpn931700|1/caseclick for more details
- Ring Only for Inverting Optimum Growth® 5L Flasknon-sterileUse with 5L Inversion Transfer CapsRequires 22" Standpn931607|1/caseclick for more details
Optimum Growth® Flask Carrier Part Numbers
- 125mL 8 Position Carriernon-sterileUse with Optimum Growth® 125mL Flask (931110)Easily transport 8 125mL flasks at a timepn1212900|1/caseclick for more details
- 250mL 8 Position Carriernon-sterileUse with Optimum Growth® 250mL Flask (931111)Easily transport 8 250mL flasks at a timepn1212905|1/caseclick for more details
Optimum Growth® Vent Cap Part Numbers
- Optimum Growth® 125mL Vent CapsterilePTFE 0.2µm for Increased Aeration | SterileFor Optimum Growth® 125mL Flaskspn899110|50/caseclick for more details
- Optimum Growth® 250mL Vent CapsterilePTFE 0.2µm for Increased Aeration | SterileFor Optimum Growth® 250mL Flaskspn899111|50/caseclick for more details
- Optimum Growth® 500mL Vent CapsterilePTFE 0.2µm for Increased Aeration | SterileFor Optimum Growth® 500mL Flaskspn899112|25/caseclick for more details
- Optimum Growth® 1.6, 2.8 & 5L Vent CapsterilePTFE 0.2µm for Increased Aeration | SterileFor Optimum Growth® 1.6, 2.8 & 5L Flaskspn899116|24/caseclick for more details
Optimum Growth® Solid Cap Part Numbers
- Optimum Growth® 1.6, 2.8 & 5L Solid CapsterileEvaporation Proof Storage Cap | SterileFor Optimum Growth® 1.6, 2.8 & 5L Flaskspn899600-B|24/caseclick for more details
Optimum Growth® Exhaust Cap Part Numbers
- Bioreactor Exhaust Capsterile2' C-Flex® (I.D. 1/4" x O.D. 3/8") Tubing | SterileUse with Optimum Growth® 1.6L Flask & bioreactorpn931713-8|8/caseclick for more details