If you look at the internal picture of the top, they have aimed the coolant down towards the base at a more agreeable angle instead of the water hitting the back wall of the top and flooding down into the base as was the case with the MCW50. Another improvement over the MCW50's top was an added wall inbetween the 2 ports so that water cannot simply bypass the diamond pins altogether. These two minor changes can make for a nice leap in performance. As for the problem of the quick-connect fittings, couldn't you just drill them out and re-tap them to accept threaded bard fittings?
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