Single Wall to Twin Wall Increaser Ø 150 - Ø 175
At a Glance
- Universal adaptor that connects single wall flue pipes to twin wall systems
- Constructed with 304 stainless steel outer and 316 stainless steel inner layers for durability
- 0.4mm thick metal construction provides both reliability and safety
- Insulated with high density compressed rockwool (200kg/m3) for excellent thermal resistance
- HETAS approved, CE marked and compliant with EN1856-1 standards
- Maintains mandatory 50mm clearance from combustible materials

Please Note: All dimensions refer to the internal diameter of flues. If unsure, please call 01670 206999 to ensure you choose the correct products.
We Won't Be Beaten On Price
At National Flues, we continuously monitor competitor prices. This ensures that we consistently offer you the best deals on all our products. Here’s how we keep your costs low:
- Daily Price Matching: Our team adjusts prices to ensure we stay competitive.
- Bulk Purchasing Power: We sell a lot, so we can negotiate better rates with suppliers, passing the savings directly to you.
- Operational Efficiency: We have streamlined processes to reduce overhead.
Price Match Guarantee: If you find the same product cheaper within 48 hours, we’ll match it and refund the difference.
Free Delivery Over £100: Orders over £100 are free delivery (call us if delivery is required outside the mainland UK).
“I saved 20% on my purchase compared to other retailers. Exceptional service!” – Jane D.
Have Questions?
Phone: 01670 206999
Email: [email protected]
- Info
- Specs
- Install
- FAQs
The Single Wall to Twin Wall Increaser Ø 150 - Ø 175 is a universal adaptor designed to connect appliance outlets to TWPro flue systems. It ensures a seamless transition from a single wall to twin wall with an effective 25 mm increase. This increaser is suitable for solid fuel and gas/oil appliances, including woodstoves, gas coal effect fires, oil and gas boilers, and any solid fuel devices.
Constructed with a 304 grade stainless steel outer and 316 grade stainless steel inner, both layers are fully welded and 0.4mm thick for maximum durability. Insulated with compressed rockwool at a density of 200kg/m3, it provides exceptional thermal resistance. The TWPro is HETAS approved, CE marked, and meets EN1856-1 standards.
Installation is straightforward with a Locking Band, and a safe distance of 50mm from combustibles is mandated.
SKU: 2-150-002
Technical Specifications | |
---|---|
Dimensions | Ø 150 - Ø 175 |
SKU | 2-150-002 |
Inner Material | 316L Stainless Steel (0.40mm thick) |
Outer Material | 304 Stainless Steel (0.40mm thick) |
Insulation | Compressed Rockwool, 200kg/m3 |
Certifications | HETAS, CE, EN1856-1 |
Safe Distance | 50mm from combustibles |
Installation Method | Locking Band provided |
Delivery Information +
We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Tuesday, April 8th. If you need faster stove or fireplace delivery please give us a call. We can often reduce longer lead times if we pay the carrier £25 for express delivery. Visit our Shipping Information page for more information.
Warranty & Returns +
All our products come with warranties. Mi-Flex offers a lifetime guarantee. Returns for damaged items are covered by insurance; non-damaged returns incur return delivery costs.
Price Match Guarantee +
We will match any price like for like. If you find it cheaper within 48 hours, we'll refund the difference.
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National Flues Ltd Verdict
National Flues highly recommends the Single Wall to Twin Wall Increaser Ø 150 - Ø 175. With exceptional performance and durability, it's a top choice for both retail and trade customers nationwide. Rarely beaten on price and always reliable.
The Single Wall to Twin Wall Increaser Ø 150 - Ø 175 is used for connecting a single wall flue pipe to a twin wall flue system, ensuring a smooth transition and proper airflow.
National Flues is a reputable supplier of fireplaces and flues in the UK, known for competitive pricing, reliable delivery, secure online payments, and availability of trade accounts.
