4" Twin Wall To Flexible Liner Adaptor

Our Price: £44.09 Incl. VAT: £52.91

Availability: In stock

Product Code: TWTF04

4" Twin Wall to Flex Adaptor



 Twin wall Warranty

4" Twin Wall to Flexible Adaptor to connect 4" twin wall flue to 4" flexible liner.

Made from 304 Stainless Steel outer and 316 Stainless Steel inner. It is fully welded and has HETAS / CE approval. 

(Please note: We base all of our twin wall system on the internal diameter measurement).


Same day dispatch if ordered before 2pm.




Twin Wall To Ultraflex Liner Adaptor


View Our Installation Guides:

Bungalow Internal Installation

Bungalow Installation guide

External House Installations

External Installation

Straight Internal Installation

Ventilation Installations


Our twin wall insulated is a simple push-fit  joint system. Build your system by placing each piece on top of the previous and push together to make the join. This is the simplest system to construct on the market today.


Building Regulations

Download Building Regulations Document J (effective October 2010) below

Download Document J

(Right click link, then select "save file as..")