How does the Fermonster work for sealing? A brewery I went to recently started using them for pilot/small batches, but I didn't think to see how they sealed. They are a similar product but without the waterdrop pattern molded in the walls. Looks like a nice, basic, fermentor.
The Fermonster has a gasket that fits in the lid. When it is screwed down, the gasket creates a seal between the lid and the base.