The Magpies took a risk when they turned down a penalty in front of the posts in the 11th minute and then lost the lineout with a brave throw to the back.
Three minutes later first five-eighth Ihaia West opened the Magpies account with a penalty from a similar position.
Magpies winger Robbie Fruean celebrated his first Mitre 10 Cup appearance of the season with the hosts first try in the 20th minute following some clever use of numbers on the short side. West added the conversion from the touchline.
Counties-Manukau replied three minutes later with a try to centre Sam Vaka after another clever kick from Pulu and the visitors led 15-10.
They extended this lead with a try to flanker Jordan Taufua in the 28th minute which Francis converted.
Four minutes later Magpies captain and hooker Ash Dixon was denied a try by solid defence. The 33rd minute saw television match official Bruce Dockary rule Magpies No 8 Fa'alemiga Selesele had lost the ball forward in a try-scoring situation.
The Magpies continued to maintain possession and dominate territory and were rewarded with a 36th minute penalty to West.
The Steelers haven't beaten the Magpies at McLean Park since they captured the Ranfurly Shield with a 27-24 victory in 2013.
Tonight's match is the 53rd first-class game between the two provinces since 1956. The Magpies have won 29 and the Steelers 22. There has been one draw.