Pack 503 - (125mm, PHCM/N/CNP/MAE)
At a Glance
- - 316L stainless steel construction for long-lasting durability
- - Designed specifically for 125mm flexible flue liner installations
- - Fully compliant with BSEN standards and Building Regulations Document J
- - Includes Pot Hanging Cowl with Mesh, Nose Cone, Black Pipe Adaptor, and Chimney Notice Plate
- - Suitable for wood (under 20% moisture), gas, oil, and smokeless coal appliances

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: [email protected]
- Info
- Specs
- Install
- FAQs
Introducing Pack 503, the optimal solution for your Pot Hanging Cowl installation needs with a 125mm flex adaptor. This installation kit, comprising MF20 MI-FLEX accessories, is meticulously designed to work seamlessly with MI-FLEX 316 and 904 flexible flue liners. Compliant with Building Regulations Document J, it ensures a fully enclosed masonry chimney, capable of withstanding temperatures up to 600°C.
Perfect for wood (under 20% moisture), smokeless coal, gas, and oil appliances, it provides everything you need for a no-hassle installation, excluding the MI-FLEX liner itself. Components include a Stainless Steel Pot Hanging Cowl with Mesh, Nose Cone, Black Pipe Adaptor, and Chimney Notice Plate.
SKU: 20-125-P503
Technical Specifications | |
---|---|
SKU | 20-125-P503 |
Item | Installation Pack No 503 - u00d8 125 |
Designation | BSEN 1856-2 T600 N1 W V2 L50012 G |
System | MI-FLEX Accessories MF20 |
Material | 316L Stainless Steel |
Colour Finish | Natural / Stainless Steel |
Fuels | Wood (under 20% moisture), Oil, Gas, Smokeless Coal |
Approvals | HETAS / CE |
Max Temperature | 600u00b0C |
Delivery Information +
We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Wednesday, April 2nd. 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. If you find it cheaper within 48 hours, we'll refund the difference.
Compatible and other products that may be of interest...
National Flues Ltd Verdict
Pack 503 is a top-tier installation kit perfect for your flexible flue liner needs. With reliable delivery and unbeatable prices, National Flues serves both retail and trade customers nationwide. Trust in our dependable service and quality products.
Pack 503 is designed for the installation of flexible flue liners in chimneys, particularly where the existing chimney pot is to remain intact.
National Flues is a premier UK supplier of high-quality fireplaces and flues, known for unbeatable prices and reliable nationwide delivery. Catering to both retail and trade customers, National Flues ensures secure online payments and exceptional service.
