The patented Primo Oval Large features up to 305 square inches of standard cooking surface, expandable up to 495" with our Extended Cooking Rack! Other features include a cast iron chimney cap, easy to read thermometer, reversible cooking grates and stainless steel lower vent door. The Primo displayed here shows the optional Primo Cart with Basket & One Piece Island Top with Two Cup Holders for Oval 300. Please see the accessories page for a complete list of Primo accessories. Specifications of the Primo Oval Large.