Long Tail MI-FLEX Adaptor - Ø 125
At a Glance
- Crafted from 0.6mm 316L stainless steel for exceptional durability
- Designed to connect rigid single wall flue systems with MI-FLEX flexible liners
- Withstands temperatures up to 600°C for safe operation
- Compatible with wood (under 20% moisture), oil, gas, and smokeless coal
- Ensures a gas-tight seal when installed with appropriate high-temperature sealant

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 Long Tail MI-FLEX Adaptor - Ø 125 is an invaluable component for any chimney system. Crafted from 0.6mm 316 stainless steel, this adaptor serves as a critical connection between a rigid single wall flue system and MI-FLEX flexible flue liners. Designed to withstand temperatures up to 600°C, it’s suitable for various fuel types, including wood with less than 20% moisture, smokeless coal, gas, and oil.
As per Building Regulations Document J, ensure it is fully enclosed within a masonry chimney for optimal performance and safety. The bottom fixing mechanism guarantees a seamless transition between flue systems, providing a gas-tight seal when properly installed with fire cement, ceramic rope, tape, or high-temperature sealant. Regular maintenance and sweeping by a competent person are crucial for longevity and efficiency, particularly for solid fuel applications.
Trust HETAS registered sweeps for professional chimney care.
SKU: 20-125-MAELT
Technical Specifications | |
---|---|
Material | 316L Stainless Steel |
Wall Thickness | 0.6mm |
Diameter | Ø 125 |
Maximum Temperature | 600°C |
Fuel Compatibility | Wood (<20% moisture), Oil, Gas, Smokeless Coal |
Approvals | HETAS / CE |
System | MI-FLEX Accessories MF20 |
Finish | Natural / Stainless Steel |
Delivery Information +
We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Thursday, April 3rd. 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
At National Flues, we highly recommend the Long Tail MI-FLEX Adaptor - Ø 125. An essential component for connecting your chimney systems, this adaptor ensures a secure and efficient transition. With our commitment to unbeatable prices and reliable nationwide delivery, both retail and trade customers can trust the quality and integrity of our products.
The Long Tail MI-FLEX Adaptor is designed to facilitate the connection between a rigid single wall flue system and a MI-FLEX flexible flue liner, ensuring a secure and efficient transitional joint.
National Flues is a leading supplier of fireplaces and flues across the UK, known for unbeatable prices, reliable nationwide delivery, and dedicated service to both retail and trade customers.
