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Screw-FIX Long Tail Adaptor - Ø 125 (25-125-MAELT)

National Flues presents the Screw-FIX Long Tail Adaptor - Ø 125, a premium chimney adaptor engineered for flawless connections between rigid flue systems and MI-FLEX flexible liners. This high-quality chimney installation accessory is built from robust 0.6mm 316 stainless steel and has been designed for both performance and compliance. Perfect for trade professionals and homeowners alike, this product ensures a secure, gas-tight seal and is ideal for installations involving wood, smokeless coal, gas, and oil. Enhance your chimney performance with this reliable, industry-approved solution.
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£27.99
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At a Glance

  • Crafted from robust 0.6mm 316 stainless steel
  • Designed for a secure, transitional joint between rigid flue systems and MI-FLEX flexible liners
  • Withstands temperatures up to 600°C (T600 designation)
  • Suitable for wood, smokeless coal, gas, and oil fuels
  • Complies with Building Regulations Document J for enclosed masonry chimneys

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:

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

The Screw-FIX Long Tail Adaptor - Ø 125 is an essential component for any professional chimney installation. Crafted from robust 0.6mm 316 stainless steel, this adaptor ensures a seamless connection between your rigid single wall flue system and MI-FLEX flexible flue liners. This fitting pairs perfectly with MI-FLEX 316 and 904 flexible liners, forming a complete, secure chimney system that complies with Building Regulations Document J.

Capable of withstanding temperatures up to 600°C (T600 designation), this adaptor is suitable for a range of fuels including wood (with less than 20% moisture), smokeless coal, gas, and oil. It is imperative to use it within an enclosed masonry chimney for optimal performance and safety. The bottom fixings precisely connect and secure the flue system, creating a gas-tight seal.

Regular maintenance, including annual sweeping by a competent person and biannual sweeping for solid fuel appliances, is recommended to ensure your chimney's efficiency and safety.

SKU: 25-125-MAELT

Technical Specifications
Material0.6mm 316 Stainless Steel
Sizeu00d8 125 mm
Temperature RatingUp to 600u00b0C (T600)
Fuel CompatibilityWood (<20% moisture), Smokeless Coal, Gas, Oil
SystemCompatible with MI-FLEX 316 and 904 flexible liners
ComplianceCE / HETAS, Building Regulations Document J
Ensure the adaptor is installed within an enclosed masonry chimney. The bottom fixings are designed to precisely connect and secure the flue system, creating a gas-tight seal. Always use appropriate high-temperature sealants such as fire cement, ceramic rope or tape to guarantee compliance and safety. Regular maintenance, including an annual sweep by a competent person (biannual for solid fuel appliances), is essential. Note that the adaptor is not suitable for external or non-enclosed installations.

The adaptor is crafted from high-quality 0.6mm 316 stainless steel, ensuring durability and longevity.

Yes, it complies with Building Regulations Document J, which requires flexible flue liners to be installed completely enclosed inside a masonry chimney.

It is suitable for a range of fuels including wood (with less than 20% moisture), smokeless coal, gas, and oil, and can withstand temperatures up to 600°C.

No, the adaptor must be used within an enclosed masonry chimney for optimal safety and performance.

Chimneys should be swept and inspected at least once a year by a competent person. For solid fuel applications, sweeping is recommended twice a year.

The use of fire cement, ceramic rope or tape, or high-temperature sealant is advisable to ensure a gas-tight seal.

Chimney sweeping should be performed by a competent person. For solid fuel applications, consult a HETAS registered sweep.
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Wednesday, April 30th. 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 on a retail basis. Give us a call if you find it cheaper and want to buy from us.

Read our review in our Screw-FIX Long Tail Adaptor - Ø 125 buyers guide

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