The size appears to be proprietary as it is neither 3/8" (too small) or 1/2" (too big). I would return the filter, but about five years ago I bought several on-line from a sponsor of one of the various Cub Cadet forums and I'm not sure where it came from without sorting through old receipts. I'll save the filter and next time I do a filter change I'll remove the nipple and see if I can make it work without creating slivers of steel.
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