Kayos
Gone......
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I know you do this for work, and I'm just mucking about, but the one with the port on the top is the internal / external one. The port is to attach pipe to vent the gas externally.
The external only one does not have the port. It's just dome shaped on top.
I mean as the internal / external name implies, external is obviously good, but, from what I recall, internal to the case is described as preferable.
Again, I'm not looking to be a tawt, just saying... : )
This exact model, clearly states external installation
https://www.bes.co.uk/tigerloop-combi-bio-de-aerator-21332
Nowhere does it mention installing inside the case, plus you would be adding potential oil leaks inside the case
You are right, the port on the top is for the external model as it's a vent, I wouldn't want anything venting inside the case either