That cap should have small holes on the very top, it's so gas comes out but bigger things don't fall in. Does yours has some? If not I would take a safety pin and make a half dozen holes.
- ISM NRP
It doesn't. I do have a round one, it has holes in it. I'll use it. Thanks.
The cap isn't necessary, you'll just need to keep a slightly closer eye on the liquid level. Also, you can just poke a hole or two in it.
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