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

Pack 704 - (175mm, P/C/PS/N/CNP/20-150-MR) (20-180-P704)

National Flues introduces Pack 704, an essential pot replacement kit designed for seamless, compliant flue liner installations. This MI-FLEX compatible kit, featuring a 150mm to 180mm MR flex adaptor, offers a complete solution perfect for chimney renovations and new installations alike.

What it’s for

Pack 704 is designed for replacing an existing chimney pot when installing a new flue liner, ensuring a secure and compliant installation process.

Full features & benefits

  • Complete Component Set: Provides every essential element for a secure chimney pot replacement and flue liner installation, reducing the need for additional parts.
  • Versatile Fuel Compatibility: Supports wood, smokeless coal, gas and oil, ensuring flexibility for various heating appliances.
  • Seamless Transition: The increasing adaptor efficiently bridges a 150mm to 180mm setup, ensuring a snug and safe fit.
  • High Temperature Resilience: Withstands operating temperatures up to 600°C, offering robust performance under demanding conditions.
  • Durable Build Quality: 316L stainless steel construction ensures longevity and resistance to corrosion, maintaining both functionality and aesthetics over time.
Now only £137.99
including free delivery Give us a call if you find it cheaper and we'll normally price match.
  • Fast deliveryMonday, November 17th*
  • Best PriceCall us to beat any price you found online.
  • Secure checkoutCard· Google/Apple Pay· Klarna· Paypal

 

Payment Options

At a Glance

  • Comprehensive kit including top plate, top clamp, nose cone, increasing adaptor, and chimney notice plate
  • Compatible with MI-FLEX 316 and 904 flexible flue liners
  • Designed for multi-fuel use (wood [<20% moisture], smokeless coal, gas, oil)
  • Engineered from durable 316L stainless steel with a natural finish
  • Fully compliant with Building Regulations Document J for 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:

  • 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

Pack 704 is your comprehensive pot replacement kit specifically designed to work with MI-FLEX 316 and 904 flexible flue liners. Perfectly designed for multi-fuel usage, these accessories ensure a secure and compliant fitting within masonry chimneys. The pack includes a top plate, top clamp, nose cone, increasing adaptor, and a chimney notice plate, offering all you need for an effective flue liner installation.

Suitable for appliances up to 600°C, this kit supports wood with less than 20% moisture, smokeless coal, gas, and oil. The system demands a masonry chimney for safe installation, meeting all Building Regulations Document J requirements. Additional components like a chimney cowl or terminal may be necessary to provide weather and bird protection.

SKU: 20-180-P704

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.

Technical Specifications
SKU20-180-P704
Product NamePack 704 - Pot Replacement Kit with 150mm to 180mm MR Flex Adaptor
Material316L Stainless Steel
Colour FinishNatural / Stainless Steel
Temperature RatingUp to 600°C
Compatible FuelsWood (<20% moisture), Smokeless Coal, Gas, Oil
SystemMI-FLEX Accessories MF20
CertificationsHETAS / CE
Components IncludedTop Plate, Top Clamp, Nose Cone, Increasing Adaptor, Chimney Notice Plate
Pack 704 is engineered exclusively for use in masonry chimneys. Prior to installation, ensure your chimney is fully enclosed in accordance with Building Regulations Document J. Follow these steps: verify precise measurements, confirm all components are present, and adhere strictly to the provided installation guidelines for MI-FLEX systems. Additional components such as a chimney cowl or terminal may be required for optimal weatherproofing and bird protection. If in doubt, consult a professional chimney sweep or installer.

Pack 704 includes a 180mm top plate, 180mm top clamp, 180mm nose cone, an increasing adaptor (150mm SW to 180mm Flex), and a chimney notice plate.

Yes, it's suitable for wood with less than 20% moisture, smokeless coal, gas, and oil appliances, supporting temperatures up to 600°C.

No, Building Regulations Document J dictates that flexible flue liners must be fully enclosed within a masonry chimney. Non-masonry enclosures like timber or plasterboard are not acceptable.

The increasing adaptor helps transition from a 150mm single wall to a 180mm flexible liner, ensuring a secure and efficient connection.

While not included, a chimney cowl or terminal is recommended to offer weather and bird protection for your chimney.

It's recommended to sweep solid fuel chimneys twice a year: once at the end of the heating season and once before the next season begins. Annual inspections and maintenance of the appliance are also advised.

For solid fuel applications, you can find a list of HETAS registered chimney sweeps at www.hetas.co.uk.

 

Call the Experts   8am-5pm
👀 6 people watching this