Cap - Ø 300
At a Glance
- Premium 316L stainless steel construction for long-lasting durability
- Designed specifically to prevent rainwater ingress in chimney flue systems
- CE marked and compliant with EN 1856-1 standards
- Versatile use in high and low-temperature, non-condensing and condensing applications
- Part of the robust SWPro system ensuring a secure, modular design

Please Note: All dimensions refer to the internal diameter of flues. If unsure, please call 01670 206999 to ensure you choose the correct products.
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
The Cap - Ø 300 is a premium quality rain cap designed to protect your chimney flue system from rainwater ingress. Constructed from high-grade 316L stainless steel, this cap ensures longevity and robust performance. The SWPro system, to which this cap belongs, is a versatile, modular single wall flue system made with a high-pressure sealing gasket (P1/H1).
Suitable for a myriad of applications including boilers, ovens, ventilation systems, and as a chimney shaft liner, the SWPro system can handle both high and low-temperature flue gasses, in positive and negative pressure environments. The whole system is CE marked and adheres to the highest industry standards.
SKU: 3-300-090
Technical Specifications | |
---|---|
Material | 316L Stainless Steel |
System | SWPro |
Clearance From Combustibles | 50mm |
Warranty | 10 Years |
Approvals | CE |
Suitable Applications | Boilers, Ovens, Ventilation Systems, Chimney Shaft Liners |
Jointing Method | Push-fit with locking band |
Installation Requirements | Jointing gaskets for P1/H1 configurations |
Delivery Information +
We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Friday, April 25th. 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
National Flues highly recommends the Cap - Ø 300 for anyone seeking a reliable rain cap for their flue system. Our products are rarely beaten on price and come with the guarantee of reliable delivery across the UK. Whether you're a retail or trade customer, we’ve got you covered.
The Cap - Ø 300 is designed to protect your chimney flue system from rainwater ingress, enhancing the longevity and efficiency of your flue system.
National Flues is a leading supplier of fireplaces and flues in the UK, committed to providing top-quality products at unbeatable prices with reliable nationwide delivery. We cater to both retail and trade customers.
