4" All Weather Cowl used to fit to the top of the flue system and is secured by way of a locking band.
This product is for gas use and has a 10mm x 10mm mesh insert.
Locking Band NOT included
Made of 316 Stainless Steel.
(Please note: We base all of our twin wall system on the internal diameter measurement, this item is not suitable for gas).
Same day dispatch if ordered before 2pm.
Download Building Regulations Document J (effective October 2010) below
(Right click link, then select "save file as..")