4" 1000mm Starter Length

Our Price: £74.97 Incl. VAT: £89.96

Availability: In stock

Product Code: TWSL104

4" Starter Length 1000mm - T/W



 Twin wall Warranty

4" 1000mm Starter length for use as the first length on gas/oil appliances. eg: Pellet and Biomass Stoves, gas coal effect fires/oil boilers.

Made from 304 Stainless Steel outer and 316 Stainless Steel, 1mm thick inner skin. It is fully welded and has CE approval.

(This product still requires an adaptor to connect to the appliance)

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

Same day dispatch on all orders placed before 2pm.


1000mm Twin Wall Length with locking band


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..")