Hmmm, That page part description says it reduces the pressure.
That's just not true.
What it does is reduce the flow/speed of the coolant not the pressure.
It is a restrictor not a regulator.
And I thought the purpose of that was to hold the heated coolant in the core a bit longer for better heat transfer.
Not disagreeing with you, but I do disagree with what they say in the description on the page.