The Off-Set 8" Liner Box with Clean Out Door is the perfect solution when you have no room for an elbow or a direct connection to the liner. This box connects to the top of your appliance and allows the liner to connect to it in a less constricted area. The 2-piece adaptor was carefully created with a design that allows the user to adjust the insert front and back in a firebox. It's top collar receives 8" flex liners and the bottom collar fits inside the outlet in the insert. Featured with a removable clean out door as well gives this item great versatility. The off-set is designed to fit 7" to 8" openings and make your burning sessions as simple as possible.