Remember back here when I wondered what these fittings were for at the renovated and redeveloped Stonnington? As soon as saw the purple fitting recently, I immediately understood. In fact if you look at the original photo, the clue was there, that is there was a fitting coloured purple.
They are inlets for water storage, the purple one being an inlet for recycled water. Somewhere underground there will be large storage tanks. The recycled water has been put to very good use, producing the most luscious fine, green lawns that would do an English manor proud and beautiful healthy looking plants and trees.
It is the way of the future. The rich will have green grass and trees and the poor will have gravel.