100 TO 315mm cowl has male end so will sit in top off you duct.
Metal Cowl, Ducting, Chinamans Hat 100-500mm, Pizza oven, Ventilation, Flue
Chimney Flue Liner Metal Reducer Ducting Stainless Steel Pipe Connector Adapter
Galvanised Metal Reducer Ducting Pipe Steel Connector Adaptor Chimney Flue Liner
