Allstar 3 inch Diameter Brake Duct Mounting Flange features a brake duct mounting flange. It has a 3 inch diameter that can be used with most brake ducting hoses. The brake duct flange rivets to the nose piece and once installed, a 3 inch diameter brake duct hose can then be hose clamped to the flange. It is backed by a 90-day limited factory and sold individually.