Tasman found it hard to penetrate Wellington’s wall-like defence but sheer persistence eventually saw Finlay Christie score Tasman’s second try.
Riley Higgins then replied with Wellington’s second try and again the visitors were behind by just one point.
But a brilliant try by local product Kyren Taumoefolau, which was then converted, stretched Tasman’s lead to 23-15 with eight minutes left.
Tasman put the icing on the cake after a long build up was rewarded with a try from Nic Sauira.
Tasman captain Quinten Strange had to go off with an injury early, but they benefited from the experience of All Black David Havili, who was released to play.
“It just shows how much it means to this region... it’s awesome to come back and play in front of our fans. I wanted to come down and try and defend it and be able to hold it today, and really grateful for the opportunity,” Havili said.
Wellington still sit at the top of the NPC table, but Tasman have a game in hand.
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