I've bought 3 of these in total. Only 1 seals properly. The other 2 leak enough air to prevent the airlock from bubbling. I like they are glass, I like that they come with a bung and an airlock, but they need to seal better.
A present for my husband and he was very pleased had it before and will have again, pleased with the service.
I always use this steriliser. This must be my 6 or 7th pot. It’s great and so easy to use