The 15s were unable to join them after losing 2-0 to the Marconi Stallions but minor premiers, the 18s have already qualified and will meet Apia Leichhardt in the decider.

The 14s will meet Sutherland Sharks after beating Marconi 3-0 on Saturday.

The Demons took the lead just before half-time through Jared Seagar and Fabian Sosa kicked them further away after the break before Alexander Doyle completed the scoring.

Blacktown won a penalty shootout 5-3 over minor premiers Manly in Grade 16 after the teams were unable to score in normal and extra time, and will meet the Marconi Stallions in the grand final.