Manly enhanced their credentials as genuine National Rugby League premiership contenders, easing past North Queensland 24-4.
The victory moved Des Hasler's side into second spot on the ladder as they chalked up a fifth successive victory at a sodden Brookvale Oval.
Two tries from Brett Stewart maintained his brilliant record on home soil, taking his tally to a remarkable 57 in 58 games with George Rose and Steve Matai also going over for the hosts.
The Cowboys, who started the game in fourth spot, again struggled in attack without co-captains Johnathan Thurston and Matt Scott, who were absent due to Queensland State of Origin commitments.
