Make sure that the stopper fits the container tightly and that it is easy to insert and remove. Test the seal by filling the container with water (or another liquid), inserting the stopper and turning it upside-down. If the stopper is of the correct size and you have pushed it in firmly, the seal should be watertight and no liquid should leak out. Thanks.
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I am an English Teacher, Mother of two, Lifelong Learner and Teacher Trainer.