Byson Universal Duct Reducer Connector Tube for Ventilation SystemsProduct Description Universal duct reducer designed for ventilation systems Connects ducts ranging from 80 mm to 200 mm Made from durable, lightweight ABS plastic Ensures a secure, airtight fit between different duct sizes Sizing Available in two sizes: 80 mm to 150 mm Available in 80 mm, 100 mm, 125 mm, and 150 mm reductions 80 mm to 200 mm Available in 80 mm, 100 mm, 110 mm, 120 mm, 130 mm, 140 mm, 150 mm, 160 mm, 170 mm, 180 mm, 190 mm, and 200 mm