If you are talking about the connection between the timing cover and the thermo housing, a short big pipe with an oring groove in the end I could be corrected but that is a much later engine or timing cover setup than the 630 came standard with. In any case, the part number that you give does not sound like a Case number as most start with a G or A. The Case parts site is down and advises you to see a dealer right now so I can't look it up.
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