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Flat increaser adapter: 125mm Flue Pipe to 150mm Twin Wall - Black

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5" Flue pipe to 6" Chimney increasing adapter

The adapter connects the 150mm diameter Twin Wall Chimney to a 125mm flue pipe beneath

It is required as the first piece in the system.

Availability: In stock


Delivery: normally within 3 working days.  Next day possible if ordered before 12 (T & C's apply). more about delivery .

For more info call 01244 913 320 or email us 

We aim to give you the best prices on all stoves, and include a free flue pipe. If you've seen it cheaper, call or email us the link.

Free flue design service  - we aim to beat any quote for similar products.


More Info


Each Item in the chimney system includes a locking band, except this first part of the system - the adapter.

Distance to combustibles is 50mm. (e.g. wood, plaster board).

Requires sealant, fire rope when fitting to fule pipe.  Twin Wall Chimney parts are secured together by using a Locking Band (supplied).

For use on solid fuel and gas/oil appliances. eg: wood burning stoves, gas, coal effect fires, oil boilers, solid fuel appliances.

Insulation: compressed rockwool, all parts fully welded.

TWPro is HETAS Approved and is CE marked.

NOTE – The 150 diameter referred to in twin wall chimneys is the internal diameter - the external diameter is 200mm and is not used to describe the part.



Diameter 150mm internal / 200mm External
Colour Black
CE Certification EN1856-1 T600 N1 D V2 L50040 G50
Inner Material 316L Stainless Steel - 0.40mm thick
Outer Material 304 Stainless Steel - 0.40mm thick


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