4 inch connect adaptor allows two length of flexible flue liner to be joined together.
Made of 316 Stainless Steel
Same day dispatch if ordered before 2pm
Push the liner between the two skins of the adaptor, then seal with fire cement, drill through the outer skin & screw in self tapping screws.
Repeat for other side.
Download Building Regulations Document J (effective October 2010) below
(Right click link, then select "save file as..")