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I just received my EZ Caps and I'm almost finished with my first batch of cider. after two days i was checking to make sure they were fermenting when I disturbed the bottle it started hissing none of the other bottles reacted the same. my question is is my cap still good? Is it damaged? I replaced it with a extra cap.

The hissing sound is just the CO2 escaping, and it is a normal occurance. Some recipes hiss more than others due to especially active fermentation.