Porsche, like many businesses, uses private labels for its parts to support the high prices (and margins) charged by dealers. It's simply a business strategy that either works or it doesn't. If the OEM supplier becomes known, then the strategy becomes less successful.
I agree with many posters that buying genuine Porsche parts is appropriate for critical parts where the consequences of a parts failure is especially costly to the owner. My own view is that the water pump is one of those critical parts.
That said, others may have a different risk calculus than me. If they want to take the risk and buy from an OEM part from a source other than Porsche, I see it entirely reasonable for them to ask fellow forum members if they know the name of the water pump OEM.
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