Imperial Black Adjustable Flue Stop, 6 to 8 in. is designed to fit flue wall openings measuring 6, 7, and 8 inches with ease. This versatile flue stop features an adjustable spring that ensures a snug and secure fit, providing reliable performance. It is available in a durable 24-gauge black matte finish or an attractive wood grain finish, allowing you to choose the style that suits your needs. Crafted for adaptability and durability, this flue stop is an excellent choice for maintaining proper flue function and safety. Model Number: BM0026