Used with Labconco Fast Freeze Flasks 120mLs up to 2000mLs. These adapters allow filling a freeze dry flask under sterile conditions prior to lyophilization. After filling the flask, the valve is closed off isolating the contents for transportation to the freeze dryer. Once the flask is attached to the freeze dryer and a vacuum is pulled, open the flask to vacuum using the adapters valve. After freeze drying, close the valve and transport the samples back to the BSC to open.