Free Delivery over £100+ 5on Trustpilot Browse our popular stoves Fast Mainland UK Delivery Buy stoves with install packs Call 01670 206 999 for help

Top-Quality Bottom Fixings for Your Fireplace - MI-Flex, Mi-FLEX Fixings

When it comes to securing your fireplace components, bottom fixings play a crucial role in ensuring everything stays in place. Explore our range of MI-Flex, Mi-FLEX Fixings designed for 125MM (5 INCH) installations. These bottom fixings are engineered for durability and ease of use, providing a reliable solution for your fireplace setup.
When it comes to securing your fireplace components, bottom fixings play a crucial role in ensuring everything stays in place. Explore our range of MI-Flex, Mi-FLEX Fixings designed for 125MM (5 INCH) installations. These bottom fixings are engineered for durability and ease of use, providing a reliable solution for your fireplace setup.


Shop By Department

StovesPremium Stoves
FireplacesStunning Fireplaces
MI-FlexFlexible Liner
Chimney FlueChimney Flue
Connecting PipesConnecting Pipes
Fans Flashings CowlsFans Flashings Cowls
Installation PartsInstallation Parts
After Care PartsAfter Care Parts

The best selling flue liner in the UK. Suitable for gas, oil, and approved solid fuels. Call our advisers on 01670 206 999 if you need any help choosing.

£19.99 £88.99
Showing 14 of 14 items
Increasing MI-FLEX Adaptor - Ø 100-Ø 125

Increasing MI-FLEX Adaptor - Ø 100-Ø 125

20-100-MR
£20.99 (including VAT)
In stock
MI-FLEX Adaptor - Ø 125

MI-FLEX Adaptor - Ø 125

20-125-MAE
£19.99 (including VAT)
In stock
MI-FLEX Adaptor 1mm - Ø 125

MI-FLEX Adaptor 1mm - Ø 125

20-125-MAE1
£30.99 (including VAT)
In stock
Long Tail MI-FLEX Adaptor - Ø 125

Long Tail MI-FLEX Adaptor - Ø 125

20-125-MAELT
£24.99 (including VAT)
In stock
Increasing MI-FLEX Adaptor - Ø 125-Ø 150

Increasing MI-FLEX Adaptor - Ø 125-Ø 150

20-125-MR
£22.99 (including VAT)
In stock
Increasing MI-FLEX Adaptor 1mm  - Ø 125-Ø 150

Increasing MI-FLEX Adaptor 1mm - Ø 125-Ø 150

20-125-MR1
£43.99 (including VAT)
In stock
Increasing MI-FLEX Adaptor - Ø 125-Ø 175

Increasing MI-FLEX Adaptor - Ø 125-Ø 175

20-125-MRD
£68.99 (including VAT)
In stock
Long Tail Increasing MI-FLEX Adaptor - Ø 125-Ø 150

Long Tail Increasing MI-FLEX Adaptor - Ø 125-Ø 150

20-125-MRLT
£38.99 (including VAT)
In stock
Register Plate Adaptor - Ø 125

Register Plate Adaptor - Ø 125

20-125-RPA
£51.99 (including VAT)
In stock
Increasing Register Plate Adaptor - Ø 125-Ø 150

Increasing Register Plate Adaptor - Ø 125-Ø 150

20-125-RPAI
£71.99 (including VAT)
In stock
Top Hat Adaptor - Ø 125

Top Hat Adaptor - Ø 125

20-125-THA
£58.99 (including VAT)
In stock
Register Plate Adaptor - Ø 150

Register Plate Adaptor - Ø 150

20-125-THAR
£88.99 (including VAT)
In stock
Screw-FIX Register Plate Adaptor - Ø 125

Screw-FIX Register Plate Adaptor - Ø 125

25-125-RPA
£42.29 (including VAT)
In stock
Screw-FIX Register Plate Increaser - Ø 125-150mm

Screw-FIX Register Plate Increaser - Ø 125-150mm

25-125-RPAI
£57.99 (including VAT)
In stock
Your Bottom Fixings Questions Answered

Are MI-Flex bottom fixings easy to install? -

Yes, our MI-Flex bottom fixings are designed for easy installation, ensuring a hassle-free setup process.

What materials are MI-Flex bottom fixings made of? +

Can MI-Flex fixings accommodate different pipe sizes? +

Do MI-Flex bottom fixings require special maintenance? +

Are MI-Flex bottom fixings compatible with different fireplace designs? +

Do MI-Flex fixings come with a warranty? +

Can MI-Flex fixings be used in outdoor fireplaces? +

Are MI-Flex bottom fixings suitable for both wood-burning and gas fireplaces? +

With our MI-Flex bottom fixings, you can rest assured that your fireplace components are securely fastened, allowing for safe and efficient operation. Whether you need Increasing Register Plate Adaptors, MI-FLEX Adaptors, or Screw-FIX Register Plate Increasers, we have you covered. Our products are crafted with precision and quality materials to ensure long-lasting performance. Say goodbye to worries about loose fittings or unstable connections with our top-quality bottom fixings.
Why Buy Bottom Fixings Products
Our MI-Flex bottom fixings are ideal for a range of fireplace installations, including both residential and commercial settings. Whether you are a DIY enthusiast or a professional installer, these fixings make the job easier and more reliable. Use them to securely attach various components such as Register Plate Adaptors, MI-FLEX Adaptors, and more. Trust MI-Flex for all your bottom fixing needs and experience peace of mind knowing your fireplace is secure and stable.

Trusted By Trade Professionals

Our Bottom Fixings products and services are trusted by hundreds of professionals nationwide. We're committed to providing quality and reliability that meets the high standards of our customers.

Dedicated Support

Experience our unparalleled customer service and support when you buy Bottom Fixings from National Flues. Our team is here to assist you every step of the way, ensuring your needs are met with expertise and care.

Call the Experts   8am-5pm