Outer shell to protect from wind. This is a pushfit system. Stainless steel. Internal cylinder with holes to let smoke escape.
CHIMNEY COWL Anti Down Draught Stainless Steel Flue Pipe Cap, Vent, Top, Cover
Chimney Cowl Anti Down Draught BLACK Flue Pipe Cap, Vent Top Cover, Exhaust Hat
4'' / 100mm CHIMNEY COWL Anti Down Draught BLACK Flue Pipe Cap Vent Top End Hat
CHIMNEY SPINNER COWL Stainless Steel, Rotating Wind Spinning Cap Vent Top Cover
Roof Rain Cap Stove Pipe Cap Vent Rain Cover Duct Closure Flue Cap Chimney Cap
Chimney Cowl Cap Pot/Guard Stainless Steel Flue Pipe Cover Cap Vent Top Exhaust