It's the $1.8 billion deal the PM says unlocks access to one of the world's biggest and lucrative markets.
But the free trade agreement signed with the EU has left the meat and dairy sectors with a sour taste in their mouths.
The deal wipes tariffs for exports including kiwifruit, onions, apples, wine, mānuka honey, seafood and fish - among others.
The government says it delivers tangible gains for exporters into a restrictive agricultural market.
But the Opposition says the Prime Minister will need to explain to farmers why there were not more gains for meat and dairy.
Here's political reporter Katie Scotcher, in Brussels.
