The inside diameter of the 2-1/2-inch side of this fitting was engineered to duplicate the 2-1/2-inch opening on your shop vacuum. Insert the shop vacuum hose directly to the 2-1/2-inch side of the fitting. The outside diameters match the?standard (Woodstock/ Shop Fox) dust collection hose to function as regular reducers.
4″ & 2-1/2″ Outside Diameter
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