Having triumphed in the 100m butterfly event on the opening day of the competition, Dailley claimed victory in the 13/14 year-olds 200m freestyle.
Dailley, who also won a relay bronze on the first night, clocked 1:58.01 for the four-length race, with his team-mate Oscar Brain taking silver in 1:59.56.
Brain, however, did triumph in the same age group’s 200m backstroke final. He finished in a time of 2:09.29, with Leander’s Charlie Boden taking second in 2:11.81.
Mount Kelly’s Oliver Taverner won the 13/14 year-olds 50m breaststroke title in 31.26, while Leander’s Great Britain international Laura Stephens winning bronze in the 16-year-olds 100m butterfly in 1:01.41.