Waiuku have reached their first final in 33 years after beating Ardmore Marist 19-15 in the semifinal.
An early penalty to Dwayne Grace had Ardmore Marist in front, but a Colin Marriner try put Waiuku in the lead - which they kept for the rest of the match.
Waiuku can thank 19-year-old first five-eighths Gavin Donald for his 100 per cent goalkicking record.
He scored with a conversion, three penalties and a drop goal to give his team their four-point cushion.
Second five-eighths Duncan Bell was outstanding, particularly in defence, mopping up the Ardmore Marist midfield who cut back all day.
Waiuku will play Papakura in next week's final at Pukekohe.
In the relegation series, Manurewa scored seven tries in their impressive 41-12 win over Onewhero - Junior Leota and Siosi Vaiala went over for two apiece - and Bombay outclassed Patumahoe 47-0 after being ahead 40-0 at halftime.
For Bombay, Clark McRobbie scored a double, while his cousin David McRobbie kicked six out of seven goals.
Rugby: Waiuku make Counties-Manukau final
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