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Gasket - Ø 125 (15-125-102)

National Flues presents the Gasket - Ø 125, a high-quality sealing component engineered for chimney flues in solid fuel, gas, and oil appliances. This gasket, made with premium 304 and 316 stainless steel, is an essential element for safe, efficient, and effective flue systems in condensing appliances. Explore our selection of high-performance gasket solutions and compatible accessories to complete your flue installation with confidence.
£3.29
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At a Glance

    Made with outer 304 and inner 316 stainless steel (0.40mm each) for lasting durability
    Ideal for solid fuel, gas, and oil appliances including condensing systems
    Includes high-density compressed rockwool insulation for energy efficiency
    HETAS approved and CE marked for industry compliance
    Secure fit with an integrated Locking Band for easy installation
    Specific combustible clearance of 50mm (TWPro) and 60mm (KC) ensures safety

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:

  • Daily Price Matching: Our team adjusts prices to ensure we stay competitive.
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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 Gasket Ø 125 is an essential component for anyone using solid fuel, gas, or oil appliances, including wood stoves, gas coal effect fires, and boilers. Constructed with an outer skin of 304 grade stainless steel and an inner skin of 316 grade stainless steel, each 0.4mm thick, this gasket ensures durability and reliability. The insulation is crafted from compressed rockwool with a density of 200kg/m3 for TWPro and 128Kg/m3 for other models.

All parts are fully welded to maintain structural integrity. The required distance to combustibles is 50mm for TWPro and 60mm for KC. Approved by HETAS and CE marked, the Gasket Ø 125 offers trusted quality and compliance with industry standards.

Secure installation is guaranteed using a Locking Band, ensuring the gasket stays firmly in place. This gasket is specially designed to work seamlessly with condensing appliances, providing a robust seal and optimal performance.

SKU: 15-125-102

Technical Specifications
SKU15-125-102
Dimensionsu00d8 125mm
Outer Material304 Stainless Steel (0.40mm)
Inner Material316 Stainless Steel (0.40mm)
InsulationCompressed Rockwool (200kg/mu00b3 TWPro, 128kg/mu00b3 other models)
ApprovalHETAS / CE
Combustible Distance50mm for TWPro, 60mm for KC
Compatible FuelsWood, Oil, Gas, Low Sulphur Coal
Before installation, ensure the chimney flue surface is clean and free from debris. Fit the gasket into the designated position using the provided Locking Band, ensuring it is securely fastened. Maintain clearances of 50mm (TWPro) or 60mm (KC) from combustible materials as specified. Always follow the manufacturer’s safety guidelines during installation and double-check alignment to ensure optimal performance.

The Gasket Ø 125 is compatible with solid fuel, gas, and oil appliances including wood stoves, gas coal effect fires, and oil and gas boilers.

The Gasket Ø 125 features an outer skin made from 304 grade stainless steel and an inner skin made from 316 grade stainless steel, both 0.4mm thick. It also includes insulation from compressed rockwool.

Yes, the Gasket Ø 125 is HETAS approved and CE marked, adhering to industry standards.

Installation is straightforward with the use of a Locking Band to secure the gasket in place. Ensure you maintain the required distance from combustibles (50mm for TWPro and 60mm for KC).

The insulation density is 200kg/m3 for TWPro and 128Kg/m3 for other models, made from compressed rockwool.

The Gasket Ø 125 is particularly required for condensing appliances to provide a reliable and secure seal.

For TWPro, the required distance to combustibles is 50mm, and for KC, it is 60mm.
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Monday, May 19th. Delivery times of products not in our warehouses depend on product availability and shipping. If you need a definitive delivery time give us a call. If you need faster stove or fireplace delivery please also 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. 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 on a retail basis. Give us a call if you find it cheaper and want to buy from us.

Read our review in our Gasket - Ø 125 buyers guide

Order the Gasket - Ø 125 today for a reliable, industry-approved seal and experience the National Flues difference—act now!

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