This connector has a built-in seal rings and a sunken design on the wall assembly, ensuring it fits perfectly when mounted to the wall vent for superior air tightness Features aluminium alloy shell, none flame spread aluminium foil hose, and stainless steel hose clamps to ensuring durability and reliability Dryer Vent Coupling Enhances by reducing risks with flame spread aluminum foil hose and shell auto aligning mechanism for quick and secure dryer vent hose attachment and detachment The dryer vent adapter comes with 2.60ft of 4inch aluminum foil hose to cover dryer vent offset ranges from 0-8inch center to center, Manufacturer: ZUJIABAO