25 Year Warranty

Increasing Adapter 4″/100mm Single Wall To 5″/125mm Twin Wall Insulated Flue Pipe

£31.36 Inc VAT

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The Shieldmaster Increasing Adaptor allows you to transition from 4″ single wall stove pipe to 5″ twin wall insulated flue pipe in one simple step. This component is typically the first twin wall flue part required when installing a twin wall chimney system. It connects directly to the stove spigot at the base and then allows connection to 5″ twin wall flue pipe or to a length of enamelled stove pipe before the twin wall system begins. Many installers recommend running a short length of enamel stove pipe directly from the stove first, as enamel pipe is more cost-effective and highly durable compared to twin wall pipe.

Installation Notes

This adaptor does not include a locking band. The next twin wall component you connect will include the required locking band. The bottom connection attaches to the stove spigot or stove pipe using fire cement. The top connection connects directly to the twin wall flue pipe.

Important Information

All twin wall flue parts are measured by their internal diameter. Due to the insulated construction, the external diameter will be approximately 2 inches larger than the stated size.

Technical Guidance

For help with installation requirements and compliance, please see our Technical Information section, which includes easy-to-understand guides covering Building Regulations for stove and flue installations.

For more information about twin wall flue installations, see our guide.

Technical Details

SKU	TTWI-BSHI-LSTN-D100-CISW
Brand	Shieldmaster
Flue System	Twin Wall Flue System
Flue Diameter	4" (100mm) - 5" (125mm)
Flue Colour	Silver
Flue Part	Adapter

Distance to Combustibles60mm
Warranty25 Years
FinishStainless
Internal Diameter125mm
External Diameter175mm
OD of Male Connection98mm
Total Height220mm
Effective Height160mm
Connections60mm Push Fit (Locking Band not required)
Grade of Steel316 Internal, 304 External
Thickness of Steel0.5mm
Insulation25mm Compressed Rockwool
Temperature Resistance450°C
ApprovalsHETAS ANC112, BS 476-20, CE, EN 1856-1:2009
DesignationT450-N1-D-Vm-L50050-G60

Manufacturer: Shieldmaster

Shieldmaster twin wall flue pipe is precision made to achieve a smaller distance to combustible materials than many other pipes on the market. At just 60mm minimum clearance to combustibles and a 25 year warranty this brand of twin wall pipe really does the job well and is built to last. With its unique push fit system it easily locks with an included band without the need for any sealant or adhesives at the joins.

Warranty Details

Shieldmaster flue products come with a 25-year warranty covering manufacturing defects, provided the system is installed and used in accordance with the supplied installation instructions. To maintain warranty validity, the flue must be professionally swept at least once a year by an approved chimney sweep, with a signed service record kept. When burning solid fuels, only those approved by HETAS or the Solid Fuel Association are permitted. Use of unapproved fuels or any indication of a chimney fire will void the warranty. For coloured flue pipes with a powder-coated finish, the surface coating is covered by a separate 2-year warranty.

Shieldmaster Twin Wall Flue Systems Brochure