1. Locate the O-ring
Use a knife or similiar tool to flip out the o-ring from the groove on the inside of the lid.
2. Remove and lubricate
Take out the O-ring on the inside of the lid, lubricate it with a thin layer of neutral vaseline or grease. Then put it back in place and close the lid firmly three times to ensure it's positioned correctly.
3. Thats it!
Well done! If airtightness has not improved, please check the other steps in our FAQ or contact us.