Box of 10 Manthorpe inline vents. 30 available in total over 3 lots. See the following link for details. https://www.manthorpebp.co.uk/roofing/roof-tile-vents-and-slate-vents-–-let-it-flow/line-slate-vent Below is the AI information eBay have supplied. The Manthorpe In-Line Slate Tile Ventilator (Manthorpe GILSV30-25) is a high-quality roof ventilator designed to promote proper airflow within a building. With a brand name of Manthorpe, known for producing reliable building materials, this ventilator ensures a durable and efficient solution for optimal indoor air circulation. Perfect for use in various industrial and commercial settings, this product is sold as a single unit, making it convenient for installation and maintenanc
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