The 27-year-old Tonga international has expressed his delight in re-signing for the club following the outfit's recent takeover.
"With Omar Khan having taken over the club, I believe the Bulls can go places and I'm delighted to be a part of things going forward," Manuokafoa told the club's official website.
"We're a tight-knit group and there are a lot of promising young lads having coming through the ranks such as John Bateman and Elliott Whitehead.
"We've got a new-look side, a new coach in Franny Cummins and I'm looking forward to working under him and playing for the Bulls in 2013 and the coming years after that."
The forward has become the second out-of-contract player after Luke Gale to commit to the club.