Non-concentric increaser 3 diameters - Ø 300
At a Glance
- Made from premium 316L Stainless Steel
- Suitable for both high and low-temperature applications
- Push-fit jointing with secure Locking Band for leak-resistant connections
- CE marked and compliant with EN 1856-1 safety standards
- Specially designed for inclined installations to prevent condensate pooling
- Versatile use in boilers, ovens, ventilation systems, and chimney liners

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 Non-concentric increaser 3 diameters - Ø 300 is a highly efficient component within the SWPro modular single wall flue system. Crafted from premium 316L grade stainless steel, this increaser is designed for both high and low-temperature applications, including non-condensing and condensing environments. Its universal design is equipped with a high-pressure sealing gasket (P1/H1), and it is ideal for usage in boilers, ovens, ventilation systems, and chimney shaft liners.
The product boasts CE marking and adheres to the stringent standards of EN 1856-1, ensuring optimal performance and safety. The SWPro system features a push-fit jointing mechanism, secured with a Locking Band, making installation straightforward. For P1 and H1 applications, jointing gaskets are necessary to prevent leaks, and maintaining a 50mm clearance from combustible materials is crucial.
SKU: 3-300-204
Technical Specifications | |
---|---|
Material | 316L Stainless Steel |
System | SWPro Modular Single Wall Flue |
Gasket Type | High-Pressure Sealing (P1/H1) |
Standards | EN 1856-1, CE Marking |
Clearance To Combustibles | 50mm |
Applications | Boilers, Ovens, Ventilation Systems, Chimney Liners |
Installation Type | Push-fit Jointing with Locking Band |
Price | 174.67 (Our Price) |
Delivery Information +
We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Friday, April 25th. 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
The Non-Concentric Increaser 3 Diameters - Ø 300 is an exceptional choice for both trade and retail customers. With our reliable nationwide delivery and competitive pricing, National Flues ensures you get the best quality flue components for your needs.
The Non-Concentric Increaser 3 Diameters - Ø 300 is designed to increase the diameter in flue systems, especially in angled installations, while preventing the accumulation of condensate.
National Flues is a leading supplier of high-quality fireplaces and flues across the UK. Known for reliable delivery and competitive pricing, we cater to both retail and trade customers, offering secure online payments and trade accounts.
