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Lid - Ø 125 (3-125-036)

National Flues presents the Lid - Ø 125, a premium stainless steel flue cap designed for SWPro modular flue systems. Ideal for both residential and commercial applications, this robust cap guarantees a secure seal against flue gases in positive and negative pressure systems. Enhance your chimney, ventilation, or duct installation with our high-quality, corrosion-resistant lid while exploring optional accessories to further optimise your setup.
The price you pay today £34.99
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At a Glance

    Superior 316L stainless steel construction
    Versatile for both high and low temperature applications
    Secure push-fit jointing with Locking Band
    CE marked and EN 1856-1 compliant
    Optimised for positive and negative pressure systems
    Essential for sealing flue branches and headers
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Friday, June 20th. 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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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).

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

The Lid - Ø 125 is an essential component of the SWPro modular single wall flue system. Expertly crafted from high-grade 316L stainless steel, this flue cap features a high-pressure sealing gasket P1/H1, making it suitable for both high and low temperature applications. Whether for non-condensing or condensing systems, this versatile lid effectively seals off the branch or base of a tee or the end of a header in your commercial or residential flue installations.

With its robust design, this lid handles flue gases in both positive and negative pressure systems. It’s perfect for boilers, ovens, ventilation systems, and chimney shaft liners. CE marked and compliant with EN 1856-1 standards, installation is a breeze with its push-fit jointing system, secured with a locking band.

When installing, ensure a 50mm clearance from any combustible materials.

SKU: 3-125-036

Technical Specifications
Material316L Stainless Steel
Temperature ApplicationHigh & Low Temperature
System CompatibilitySWPro Modular Single Wall
ApprovalsCE, EN 1856-1
Seal TypeHigh-pressure sealing gasket P1/H1
Installation MethodPush-fit jointing with Locking Band
Clearance Requirement50mm from combustibles
Warranty10 Years
Ensure a consistent 50mm clearance from any combustible materials during installation. Fit the Lid - Ø 125 using the push-fit jointing system, securing it with the provided Locking Band. It is essential to use the correct gaskets (P1/H1) at each joint to maintain the integrity of the flue system. Always double-check the seal after installation to ensure there are no leaks or areas of weakness.

This flue cap is used to close off the branch or base of a tee or the end of a header, ensuring a secure and airtight seal.

Yes, it is designed for both high and low temperature applications, making it highly versatile.

It is made from high-grade 316L stainless steel, known for its durability and resistance to corrosion.

It features a push-fit jointing system that is secured with a Locking Band. Ensure you fit jointing gaskets on every joint for P1 and H1 installations.

It is CE marked and compliant with EN 1856-1 standards.

Yes, it is designed to handle flue gases in both positive and negative pressure systems.

Yes, maintain a 50mm distance from any combustible materials (wood, plasterboard) during installation.

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