The match was evenly poised at halftime with the teams deadlocked at 10-10 but the defending champions just had enough in the tank to repel the determined challenge of Gwyr.
In the Welsh Schools U11s Cup, Castell Nedd beat YGGG Llantrisant by 7 tries to 6 after leading by 6 tries to 3 at half time in the Welsh Schools U11s Cup at the Principality Stadium.
Welsh Schools U11s Cup final
Scorers: Castell Nedd: Joel Colwill (2), Lewys Ware (2), Iestyn Williams, Morgan Francis, John Pritchard.
YGGG Llantrisant: Aled Willan (2), Can Rogers (2), Rhyd Ian Smith-Wilkes (2)
