They are mainly used for chimney flue liners and ventilation ducting system. Chimney Flue Liner Reducer.
Chimney Flue Liner Metal Reducer Ducting Stainless Steel Pipe Connector Adapter
Metal Cowl, Ducting, Chimney Top, 100 - 315mm, Bird mesh, galvanised,ventilation
Galvanised Steel Reducer Duct Pipe Metal Connector Adaptor Chimney Flue Liner
Reducer Ducting Pipe Connector Adaptor Chimney Flue Liner Stainless Steel
