Shieldmaster is a precision engineered, twin wall insulated flue system offering a complete range of components for every type of installation. Crafted with ease of use in mind, Shieldmaster utilises a secure push fit connection which when connected with the provided locking band, creates a sealed joint between all parts. Shieldmaster is CE certified, tested compliant to EN1856-1:2009, BS476-20 and fully HETAS approved.

The Single to Twin Wall Increasing Adapter is used to seamlessly convert from vitreous enamelled flue pipe (single wall) to Shieldmaster twin wall pipe whilst increasing the internal diameter of the flue system by one inch. Can also be used directly in the outlet of the stove although not recommended for powder coated black Twin Wall. If you are not increasing the internal diameter of your flue system when converting from single skin pipe to Twin Wall, please do not select this Adapter as you require the standard 'Single to twin Adapter' instead.

  • 4” Selection = 4” Single to 5” Twin Wall Increasing Adapter
  • 5” Selection = 5” Single to 6” Twin Wall Increasing Adapter
  • 6” Selection = 6” Single to 7” Twin Wall Increasing Adapter
  • 7” Selection = 7” Single to 8” Twin Wall Increasing Adapter
  • Part: Single to Twin Wall Increasing Adapter
  • Brand: Shieldmaster
  • Colour: Stainless Steel
  • Warranty: 25 years
  • Approvals: CE & HETAS ANC112
  • Designation: EN:1856-1 T450 N1 D VM L50050 G(60)
  • Thickness of steel: 0.50mm
  • Height: 140mm
  • Grade of Inner Wall Steel: 316
  • Grade of Outer Wall Steel: 304
  • Distance to combustibles: 60mm
  • Fuels: All Solid Fuels, Gas & Oil
  • Temperature resistance: 450°C
  • Locking band included: No
  • Compatible with other brands: Shieldmaster only
  • Connection: Push Fit
  • Despatched from stock

Insulated Twin Wall flue components are listed by their internal diameter only.

Shipping and Returns

Returns are accepted within 30 days of purchase for a refund. A returns authorisation number must be obtained from us, either by contacting us directly or via an eBay Return Request. Items must be returned unused and in a re-sellable condition for a refund to be issued.

We aim to offer free delivery wherever possible; however, a small number of UK locations incur unavoidable additional charges due to courier hub coverage. If your order is affected, we will contact you on the next working day. These charges are separate from and not calculated by eBay’s postage calculator.

All stoves and larger orders are delivered palletised via a one-man, kerbside delivery service only. This means delivery is made to the roadside, and drivers may refuse access to certain locations depending on site conditions. Customers must ensure sufficient manpower is available to move the pallet from the kerbside to the desired location. This is the customer’s responsibility. Failed deliveries or requests for redelivery may result in additional charges.