Top Insert Sleeve - Ø 125 (20-125-PS)
-
Fast deliveryMonday, November 17th*
-
Best PriceCall us to beat any price you found online.
-
Secure checkoutCard· Google/Apple Pay· Klarna· Paypal
At a Glance
- Made from robust 316L stainless steel
- Natural / Stainless Steel finish for longevity
- Withstands temperatures up to 600°C (T600)
- Certified to HETAS and CE standards
- Compatible with wood (under 20% moisture), oil, gas, and smokeless coal
- Designed for use with MI-FLEX Accessories MF20 systems
- Essential for supporting the weight of flexible flue liners
- Works in tandem with Top Plate and Top Clamp
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 Top Insert Sleeve - Ø 125 is an essential component for anyone installing or maintaining a chimney system using MI-FLEX 316 and 904 flexible flue liners. This expertly designed accessory slides seamlessly into the flexible chimney liner at the top of your installation. Used in conjunction with a Top Plate and Top Clamp, it ensures that the flue liner's weight is securely supported without compromising its integrity.
This robust sleeve is suitable for a range of fuel types including wood with less than 20% moisture, smokeless coal, gas, and oil, and can withstand temperatures up to 600°C (T600). According to Building Regulations Document J, a flexible flue liner must be entirely enclosed within a masonry chimney, making the Top Insert Sleeve an indispensable part of your setup. Proper maintenance is crucial; sweeping and inspection should be conducted at least annually by a qualified professional to ensure longevity and performance.
SKU: 20-125-PS
Delivery Information* +
We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Monday, November 17th. 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 |
| Colour Finish | Natural / Stainless Steel |
| Temperature Rating | Up to 600°C (T600) |
| Approvals | HETAS / CE |
| Compatible Fuels | Wood (<20% moisture), Oil, Gas, Smokeless Coal |
| System | MI-FLEX Accessories MF20 |
| Dimensions | Ø 125mm |
| Designation | BSEN 1856-2 T600 N1 W V2 L50012 G |