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Tee 90° reduced connection Ø 175 - Ø 400 (3-400-R90-175)

At National Flues, our Tee 90° Reduced Connection is engineered from top-grade 316L Stainless Steel to ensure durability and precision in every installation. This essential flue component, part of the SWPro system, provides a seamless connection for flue diameters from Ø 175 to Ø 400. Perfect for use in boilers, ovens, ventilation systems, and chimney shaft liners, it combines reliability with rigorous CE compliance, making it an indispensable choice for both trade and retail customers. Explore Read more...
The price you pay today £430.99
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At a Glance

    Crafted from high-grade 316L Stainless Steel
    Compatible with SWPro modular flue systems
    Push-fit jointing with a secure locking band
    CE marked in accordance with EN 1856-1 standards
    Versatile flue diameter range (Ø 175 to Ø 400)
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Friday, June 27th. This is based on current delivery times for this product. Delivery for products not in our warehouses can be delayed because of third party carriers. If you need a stove, or other bulky product, to be delivered by a specific time in the next 7 days then please give us a call. We can sometimes 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 and you can read in our blog about they types and terms and conditions for warranties. Mi-Flex flue liner, for example, comes with a lifetime guarantee. Give us a call if you want to know about a specific warranty. Returns for damaged items are covered by insurance; non-damaged returns incur return delivery costs.

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We will match any price, like-for-like, on a retail basis. Give us a call if you find it cheaper and want to buy from us.

Please Note: All dimensions refer to the internal diameter of flues. If unsure, please call 01670 206999 to ensure you choose the correct products.

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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:

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Price Match Guarantee: If you find the same product cheaper within 48 hours, we’ll match it and refund the difference.

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Have Questions?
Phone: 01670 206999
Email: [email protected]

The Tee 90° reduced connection Ø 175 - Ø 400 is a versatile component within the SWPro modular single wall flue system. Crafted from high-grade 316L Stainless Steel, it ensures durability and reliability in various high and low-temperature applications, including boilers, ovens, ventilation systems, and chimney shaft liners. The SWPro system, featuring a high-pressure sealing gasket P1/H1, accommodates both condensing and non-condensing applications, handling flue gases under positive and negative pressure.

Easy to install with a push-fit jointing system and locking band, this component fully conforms to CE marking standards under EN 1856-1 regulations, ensuring safety and performance.

SKU: 3-400-R90-175

Technical Specifications
Material316L Stainless Steel
Flue Diameter Rangeu00d8 175 to u00d8 400
ApplicationsBoilers, ovens, ventilation systems, chimney shaft liners
ComplianceCE marked, EN 1856-1
Jointing SystemPush-fit with locking band and sealing gaskets
Warranty10 Years
• Ensure a minimum clearance of 50mm from any combustible material, such as wood or plasterboard • Follow the SWPro system guidelines: fit a sealing gasket at every push-fit joint to achieve optimal pressure handling • Secure the component using the locking band provided to prevent movement or disconnection • When using optional accessories like mounting brackets or additional sealing components, verify compatibility with your specific flue system • Always refer to the installation manual and safety regulations before commencing work

It is made from high-grade 316L Stainless Steel, known for its excellent resistance to corrosion and high temperatures.

It’s ideal for boilers, ovens, ventilation systems, and as a chimney shaft liner, handling both positive and negative pressure settings.

No, the Tee 90° Reduced Connection is not suitable for condensing systems.

The SWPro modular flue system uses a push-fit jointing system, secured with a locking band. Jointing gaskets must be fitted at every joint for P1 and H1 installations.

The Tee 90° Reduced Connection conforms to CE marking standards under EN 1856-1 regulations.

This reducing tee fits flue diameters ranging from Ø 175 to Ø 400.

Ensure a distance of 50mm is maintained from the outside of the flue to any combustible material like wood or plasterboard.

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