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Alright, I got it wrong 🙂

The vent that is leaking is an ESI Automatic air vent, it leaks when the internals get gunk blocking the float resealing once air has been let out.
- Not sure if when it can't reseal whether more air can be sucked in. I will try to service, else replace it... Not something I'll look forward to, as it will mean another drain down, wasting more inhibitor 🙁

Will do some more research to compare an air separator to an automated air vent...
 

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