Screw-FIX Long Tail Increaser - Ø 100-125mm (25-100-MRLT)
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Fast deliveryFriday, November 14th*
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Best PriceCall us to beat any price you found online.
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At a Glance
- Premium 316L stainless steel construction for durability and reliability
- Seamless connection between ridged single wall flue systems and MI-FLEX flexible liners
- Compliant with Building Regulations Document J for enclosed flexible liners
- Supports multi-fuel applications including wood, smokeless coal, gas, and oil
- Engineered to handle temperatures up to 600°C (T600 designation)
- Optimised for use with MI-FLEX 316 and 904 flexible flue liners
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: sales@nationalflues.com
- Details
- Specs
- Install/Packs
- FAQs
The Screw-FIX Long Tail Increaser Ø 100-125mm is a high-quality 0.6mm 316 stainless steel adaptor designed to facilitate a seamless transition between a ridged single wall connecting flue system and a MI-FLEX flexible flue liner. Perfectly engineered for use with MI-FLEX 316 and 904 flexible flue liners, this increaser effectively enhances the overall performance and safety of your chimney system. It is suitable for multi-fuel applications including wood (<20% moisture), smokeless coal, gas, and oil appliances sustaining temperatures up to 600°C (T600 designation).Building Regulations Document J stipulates that a flexible flue liner must be entirely enclosed within a masonry chimney.
The Screw-FIX Long Tail Increaser ensures compliance with these regulations and guarantees a gas-tight seal when used in conjunction with fire cement, ceramic rope, tape, or high-temperature sealant. Regular maintenance and sweeping by a HETAS registered sweep are recommended to prevent blockages and maintain optimum performance.
SKU: 25-100-MRLT
Delivery Information* +
We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Friday, November 14th. This is based on current lead times. Bear in mind that it is a busy time of year. If you need a product delivered by a specific time in the next 7 days, then please give us a call on 01670 206 999. Visit our Shipping Information page for more information.
About National Flues Ltd +
We began over 30 years ago as a fireplace shop in the North East. We now supply hundreds of trade professionals and thousands of retail customers, all across the UK, every month. We are still a family owned business, lead by the MD Neil, and always try our best to deliver the best possible experience. We also price match, so give us a call if you find this cheaper and want to buy from us. Visit our about us page to read a bit more.
This is us — real advice over the phone, or at the counter, and real stock in our warehouse.
| Technical Specifications | |
|---|---|
| Material | 316L Stainless Steel |
| Size | Ø 100-125mm |
| Thickness | 0.6mm |
| Maximum Temperature | 600°C (T600 designation) |
| Compatible Liners | MI-FLEX 316 and 904 |
| Fuel Compatibility | Wood (<20% moisture), Smokeless Coal, Gas, Oil |
| Standards | CE / HETAS, Building Regulations Document J |