His 16-year-old teammate, Libby Bradley, nabbed a New Zealand record in the 100m rescue medley, with her 1m 19.69s time taking nearly 2secs off the old mark, and adding gold in the 200 obstacles swim and bronze in the 50 manikin carry and 100 manikin carry with fins.
A big contingent of Mount masters athletes also won plaudits for their poolside efforts, keeping the competition on schedule by helping with safety and logistics.
Bradley, a star age group swimmer for the Greerton Swim Club, said the Mount team spirit provided an amazing lift throughout the weekend.
"It was great to come out of the pool and be greeted by excited and supporting teammates," she said. "It really added to the buzz."
O'Connor is excited to get the chance to take his pool form on to the sand for the upcoming season.
"One of my favourite sayings is 'hard work always pays off' and there was certainly a lot of hard work going into the weekend from the whole squad," O'Connor said. "It's great to see it paying off and now we're keen to work equally hard on the beach this summer."
His performances over the weekend have also seen O'Connor added to the New Zealand Youth Squad, alongside Oscar Williams (Whangamata), Jenna Barrett (New Plymouth Old Boys), Alaynah Bettany (Lyall Bay) and Jessica Blakeman (Midway).
Papamoa's Jacob Hales was added to the New Zealand open squad after a strong performance in the under-19s.
-Papamoa's Natalie Peat is one of eight athletes selected to represent New Zealand at European pool competitions next month. The team was announced at the NZ Pool Championships.