It would be the hose that is downstream of the water pump.
If you intend to flush the core, it does not matter which one is inlet. Take them both off and flush. I looked around and could not find out which is which however, in regard to your question
Ok I found that the upper hose is feed and lower is return
want to put a tee in for flushing system
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Maintenance & Repair
See the question
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