The thermos stopper is defective: they used industrial type of black rubber gasket (which is very low quality and short endurance limit) in place of original red high temperature food rubber gasket. Additionally, the stopper mold was not as high quality as it was suppose to be (in comparison with real Alladin thermos stopper).
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This review is from: Stanley Replacement Stopper (Sports)
This cap seems to seal well enough to hold the liquids in but it can't seem to hold the steam in and makes squeaky sounds when the thermos is full of coffee. The original cap didn't have this issue.
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