"Everything about this slate vent is good, it's design and the way it installs invisibly. Until you try to attach your extractor or vent pipe to it. In the product info it states "Compatible with SUA pipe adapter." Why don't screwfix either supply it with the adapter or offer it as an option as with similar vents. I bought this and wasted a load of time trying to find a supplier of the adapter without success from any number of building and roofing suppliers. Come on Screwfix check your products for usability!"