Thanks for the replies...
While mucking around under the nav station, I found a second box with MMI parts in it -- along with an o-ring gasket that fit. Lo-and-behold, it all went together in five minutes. After priming the system, the pump was moving water like a firehose -- and without leaking.
The takeaway: the o-ring is a spare you want to have aboard.
Thanks again!
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