Tapco Synthetic Vent Slate Adaptor Description For adapting round vent pipe to fit the square TapcoSlate Vent fixture. Note This is only avaliable in Black. The Height of Innovation TapcoSlate is the next generation of premium roofing products. It's a perfect combination of the natural beauty found in slate along with the most technologically advanced methods and materials. Multiple moulds are used to create Tapco slate with different edges and surfaces, giving it the look of authentic slate. Strength and durability is achieved using an exclusive 100% recyclable blend of virgin resins and natural limestone that has been compression-moulded. Tapco slate looks virtually identical to natural slate, yet it will not break or shatter and weighs 80% less than its natural counterpart.