We sell complete kits for cooker hoods and for tumble dryers. For example our Domus flat channel kit comprises of the following components: double airbrick. double airbrick adaptor. flat channel - 1 m x 2. flat channel connector. horizontal 90° bend. elbow bend with 150 mm rotating offset spigot. threaded hose connector with socket x 2. round PVC flexible hose 1m.