Yeah the lid snaps on but not as tightly as my other two buckets. Like I said, this one was (is) a monster. So much gas and foam was being produced that the airlock body with a blowoff hose attached could not relieve it fast enough to prevent the lid from bulging and losing its seal. I would push the lid down and force the gas/foam out through the blowoff and I could feel the pressure pushing back against my hands. It was impressive.
Maybe the blowoff was too long? geez, it was 1/2 inch silicone