Underground duct banks consist of large groupings of conduits which serve everything from primary power systems to fiber, communication, secondary entrances, and fire alarm networks. Existing underground duct banks are frequently tapped into for additional services to new buildings. These conduit runs need a safe access structure for maintenance. Panel manholes from Advance Concrete Products Co. allow the duct bank to remain in position during construction. Measurements are taken after excavation, sent to Advance the same day, and a brand new, custom precast concrete panel manhole can be delivered and installed in the excavation within 48 hours. Do you have traffic planned over the new manhole location? No problem. We achieve concrete strength to handle heavy truck loading quickly with custom mix designs. Precast concrete saves you time and money.