Thats a Maze2 'classic'. I have one of the last ever made. Actually me and GuyBFF (haven't heard of him in ages) ordered at the same time and he got the new and I the old.
Its actually a pretty good design if you throw enough flow at it. It was replaced with the high flow model after DD switched to 1/2 for most of their orders though. I don't have a diode to monitor with, but it consistantly gave me temps < 8C of coolant temp across two different systems w/ an Eheim 1250.
As for 1/2 being a joke, not so. Its all 1/2 through. As I recall the first 1/2 inch systems on [H] were all Maze2s that people converted. Performance was improved enough that people started bugging DD to do the same.
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