Parnell's booked their place in the U21 'C' football decider thanks to a 1-13 to 0-9 victory over St Mark's at Chanel on Sunday morning.
The Coolock men were fully deserving of the win, but Mark's made them work until the bitter end and it took a Daryl Curley goal 10 minutes from time to secure the result.
The winners led by three at the break. Graham George was excellent at centre-back and burst forward to kick two great points. Adam Judge was another to impress while Sean Geraghty was a rock in defence.
The opened up a seven-point lead after half-time, Curley and Lee Fogarty both getting points.
But Mark's came back strongly and reduced the deficit to just three points entering the final 10 minutes.
They couldn't breach the gap fully, however, and Curley's goal, coupled with a late Fogarty point meant Parnell's qualified for the final to take on St Anne's.
"Mark's were very resilient," said winning manager Dave O'Hanlon afterwards.
"But we are delighted with the win. Anne's are a good side and the final will be a big test."