Cuala were appearing in their second successive final and were hoping to retain the title, while Na Piarsaigh were lining out in their second All-Ireland decider ever and their first since 2016.
Na Piarsaigh appeared to be cruising to victory as added-time approached, but Seán Moran fired a 63rd minute free to the net to force extra-time.
David Breen goaled for the Limerick champions in the first period of extra-time, but points from Con O'Callaghan and Mark Schutte – both of whom had been held scoreless until then – and Treacy’s 12 frees ensured a second shot for Cuala.
[2] The game turned in Cuala's favour in the 39th minute when Tommy Grimes' stray hand pass was intercepted by Nicky Kenny and punished for a goal.
Cuala led 2-11 to 0-11 and looked to be in pole position to retain their crown, however, Na Piarsaigh were at the very best in the final quarter.