No 5 Silicone Masterflash 102-178mm (4 to 7 inch) - High Temp.
At a Glance
- High temperature resistance (-74°C to 260°C)
- Durable silicone construction designed for extreme weather
- Quick one-piece installation (typically under 5 minutes)
- Versatile design for both profiled sheeting and flat panel roofs
- Complete Fixing Kit included with sealant, screws and caps

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 No 5 Silicone Masterflash 102-178mm (4 to 7 inch) - High Temp is engineered for excellence. Made from durable silicone, this flashing is specifically compounded to withstand extreme temperatures ranging from -74°C to 260°C. It's an ideal solution for securing a seal on both profiled sheeting and flat panel surfaces, regardless of pipe location.
The one-piece construction allows for rapid and straightforward installation, generally taking no longer than five minutes on-site. Additionally, its base is expertly designed to fit various panel configurations and roof pitches. To install, simply choose your pipe opening, trim the flashing, slide it over the pipe, mould it to the roof profile, apply sealant from the included Fixing Kit, and fasten using the screws and caps provided.
This robust and versatile product ensures a reliable seal, making it a must-have for professionals and DIY enthusiasts alike.
SKU: 32-502
Technical Specifications | |
---|---|
SKU | 32-502 |
Item | No 5 Silicone Masterflash 102-178mm (4 to 7 inch) - High Temp |
Base Size | 280 x 280mm |
Pipe External Diameter | 101-210mm |
Roof Pitch | 0-18u00b0 |
Temperature Range | 225u00b0C Continuous - 260u00b0C Intermittent |
Material | High Temp Silicone |
Delivery Information +
We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Thursday, April 3rd. 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
The No 5 Silicone Masterflash 102-178mm (4 to 7 inch) - High Temp is a top-tier choice for both retail and trade customers. With its high-temperature resistance and simple installation, it's an unbeatable option. Enjoy reliable nationwide delivery from National Flues.
The No 5 Silicone Masterflash is used to create a reliable seal around pipes on metal roofs, accommodating various configurations and high temperature scenarios.
National Flues is a leading UK supplier of fireplaces and flues, committed to providing high-quality products at competitive prices. Serving both retail and trade customers, National Flues guarantees reliable nationwide delivery and secure online transactions.
