Dryer Vent to ShopVac Adapter with brush pass through

This lets you hook up your ShopVac with standard 2.5" hose to your standard US 4" Dryer Vent. The ID of the ShopVac hose side is 2.3", which fits my Rigid vac perfect and should be good for any other 2.5" hose. The vent side is 4.2" and tapers to 4.0" for a nice taper down and snug fit. The hole for the cleaning brush to pass through is 0.43" and fits perfectly the cleaning brush I picked up at my local hardware store. I see them for sale on amazon as well.