Unfortunately, it has brought up to our attention that there was a air leak in our 1.5L dosing container. The leak was from the side connection, what we found was at the join the glue dried up and left a little air hole. When the dosing unit pull the liquid, air entered from this hole.
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or you can easily prepare it with little silicone.
You can exam the join and see little gap / hole at the join. You can apply little silicone around the join areas, let it dry for about 1-2 hours. This would solve the issue.
You also can remove the connection buy counterclockwise the fitting. Then apply little silicon in the male thread area then screw the fitting back. Let it dry for about 1-2 hours, this would solve the issue.