Three thousand baths - See 1 Kings 7:23 note. It is quite possible that either here or in Kings the text may have been accidentally corrupted.
Related Commentaries of 2 Chronicles 4:5
2 Chronicles 4:5
5 And the thickness of it was an handbreadth, and the brim of it like the work of the brim of a cup, with flowersa of lilies; and it received and held three thousand baths.