Two tries each from full-back Gavin Nugent and hooker O'Byrne, plus one each from Conail Murphy, Kevin Kidney and Graham Mackessy, plus four conversions and a two penalty kicks from Kidney, brought the cup back to UCC.
This is the third trophy the UCC U-21 side have won this season when adding the Waterpark Ellickson/Kavanagh trophy back in October and the coveted Fraser McMullen All Ireland Under-21 title (for a fifth time - 1997, 2002, 2004, 2007 and 2010).
A chance to add yet another title slipped by when UCC lost the final of the Under-21 Intervarsity Conroy Cup to UCD back in October in Cork, losing 15-11 to the Dublin side.
Last week the UCC J2s won their third successive Cup title when they beat Cobh 14-13 at Musgrave Park.
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