Hanson Pipe & Precast is the largest manufacturer of concrete pipe and precast in North America, with more than 150 facilities in 26 states and Ontario, Canada. Hanson Pipe & Precast, a division of Hanson Building Products North America, is a sophisticated, diversified manufacturer of concrete pipe and a variety of supporting products including manholes, drainage structures, box culverts, bridge components, retaining walls, railroad crossings and concrete block.