Cresomo 101oz Stainless Steel Vacuum Airpot plunger stuck after cleaning?

Cresomo 101oz Stainless Steel Vacuum Airpot plunger stuck after cleaning? - Collection of stainless steel straight and bent straws placed on reusable bags on table

The plunger or stem in my Cresomo 101oz Stainless Steel Vacuum Airpot is stuck after I cleaned it once after receiving and taking out of the package to wash it.

I've heard it suggested that I could get it out of there by heating it up; and I've also heard that I could use a pair of tongs to pull it out; but neither has worked, and the rubber plunger remains lodged below the hole in the middle of it.

Both of the people I talked to who gave me the advice above, work in the Food and Beverage Industry.

What else can I do to pull that plunger out of it so that it can be used for the first time?






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Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Sarah Chai, Nikolaos Dimou, Skylar Kang, Uriel Mont