The double was last achieved in 2008 by Castletroy College who, until Wednesday next, are the reigning Munster Schools Junior Cup champions.
Rockwell College overcame the title holders 10-7 at the quarter-final stage in Clanwilliam Park and went on to suffer a 20-3 home defeat to PBC in the semi final.
Crescent overcame Glenstal Abbey School 25-7 in the second semi final at Rosbrien to book their final spot.
SEAT Munster Schools Junior Cup Final
PBC v Crescent College Comprehensive
Date: Wednesday, 26th March 2014