Increaser 2 diameters - Ø 650
At a Glance
- Premium 316L stainless steel construction
- Suitable for both high and low temperature applications
- CE marked and EN 1856-1 compliant for safety and quality
- Versatile design ideal for boilers, ovens, ventilation systems, and chimney shaft liners
- Quick installation with a secure push-fit joint and locking band

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 Increaser 2 diameters - Ø 650 is a versatile component within the SWPro modular single wall flue system. Constructed from premium 316L stainless steel, this increaser excels in both high and low temperature environments, suitable for non-condensing and condensing applications. The unit features a high-pressure sealing gasket (P1/H1) ensuring a secure fit and outstanding performance.
Ideal for a myriad of uses such as boilers, ovens, ventilation systems, and chimney shaft liners, the Increaser 2 diameters - Ø 650 adheres to stringent safety and quality standards. It’s CE marked and complies with EN 1856-1 specifications. Installation is straightforward thanks to the push-fit jointing system, secured by a locking band.
Remember to maintain a minimum 50mm distance from combustible materials to guarantee safety.
SKU: 3-650-102
Technical Specifications | |
---|---|
Model | 3-650-102 |
SKU | 3-650-102 |
Inner Material | 316L Stainless Steel |
Compliance | CE Marked, EN 1856-1 |
Applications | Boilers, Ovens, Ventilation Systems, Chimney Shaft Liners |
Temperature Suitability | High and Low Temperature Environments |
Distance To Combustibles | Minimum 50mm |
Installation Type | Push-fit Joint with Locking Band |
Warranty | 10 Years |
Delivery Information +
We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Tuesday, April 29th. 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.
Compatible and other products that may be of interest...
National Flues Ltd Verdict
The Increaser 2 Diameters - Ø 650 is a top-notch product that excels in versatility and durability. Made from high-grade 316L stainless steel, it’s perfect for both commercial and residential use. National Flues provides dependable nationwide delivery and competitive pricing, making this an excellent choice for retail and trade customers alike.
The Increaser 2 Diameters - Ø 650 is designed to expand the diameter of existing flue system components, ensuring efficiency and safety in both commercial and residential applications.
National Flues is a leading supplier of high-quality fireplaces and flue systems in the UK, committed to providing reliable products at competitive prices. Serving both retail and trade customers nationwide, National Flues ensures secure online payments and dependable delivery.
