<https://flexibleflueliners.com/product/guy-wire-bracket-twin-walled-pipe-200mm-black/#product>
<http://schema.org/description>
"HETAS approved, black and Stainless Twin Wall flue components and associated parts for creating new internal and external flue systems.\r\n\r\nAvailable in 125mm-200mm internal diameters, all insulated parts feature a 25mm layer of Rockwool insulation, creating a 50mm greater outer diameter and come supplied with a Locking Band where applicable."
<https://flexibleflueliners.com/product/guy-wire-bracket-twin-walled-pipe-200mm-black/>