Hon&Guan 3 x 8FT Insulated Duct with 4 to 3 Inch Duct Reducer

APPROPRIATE SIZE : On one side there is a 99mm Female Spigot（inner：97mm） - Will fit into 4'' dust collection hose/4 inch fan. On the other side there is a 73mm(inner：71mm) Male Spigot - Will fit into 3 inch duct/exhaust fan., DURABLE MATERIAL : 4 inch to 3 inch duct reducer made of galvanized steel, which is stronger and more resistant to high temperatures than ordinary plastic or pvc duct reducer, and is suitable for dryer vent environments., EASY INSTALLATION :No tools are needed to install the 4 to 3 reducer, our calibre makes it easier to fit your duct on, and with the purchase of Hon&Guan hoses, clamps are included to make the duct connection between your reducer and the hose even tighter.,3 Inch Flexible Hose Lightproof: Thick layer of black PVC on dryer hose prevents light leaks. Works with exhaust and intake fans, carbon filters and hooded lights which are 3 in diameter,3-Layer Tough: Hon&Guan 3 inch duct hose keep your ventilation system free of rips and pin holes. The flex duct is built with 2 layers of aluminum foil with a layer of PET and steel wire helix to preserve the shape, keep your ventilation system free of rips and pin holes