Cork have landed their first National Hurling League Division One A title since 1998.
Darragh Fitzgibbon, Alan Connolly and Ethan Twomey scored first-half goals as the Rebels beat Tipperary by 3-24 to 23-points at Pairc Ui Chaoimh.
Waterford withstood a second-half comeback from Offaly to win by 1-27 to 2-20 in the One B decider.
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