No 4 Silicone Masterflash 76-152mm (3 to 6 inch) - High Temp.
At a Glance
- High temperature tolerance: from -74°C up to 260°C
- Durable, weather-resistant silicone material
- Versatile use on profiled sheeting and flat panel surfaces
- Rapid, one-piece installation in under five minutes
- Engineered for a watertight seal on varied roof pitches

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 4 Silicone Masterflash 76-152mm (3 to 6 inch) is a versatile and high-performance flashing solution suitable for profiled sheeting and flat panel surfaces. With a remarkable temperature resistance ranging from -74°C to an impressive 260°C, it is designed to endure extreme conditions. Constructed from durable silicone, it offers maximum resistance against weathering caused by ozone and ultraviolet light.
The one-piece construction ensures a quick and hassle-free on-site installation, typically completed in under five minutes. The flashing’s base is ingeniously crafted to form a watertight seal on various panel configurations and roof pitches, irrespective of the pipe location. To install, simply trim the opening, slide the flashing over the pipe (with optional lubrication), form it to match the roof profile, apply the sealant provided in the Fixing Kit, and secure it with the supplied screws and caps.
For best results, use one Standard Fixing Kit per installation.
SKU: 32-402
Technical Specifications | |
---|---|
SKU | 32-402 |
Item | No 4 Silicone Masterflash 76-152mm (3 to 6 inch) - High Temp. |
Base Size Diameter | 254 x 254mm |
Pipe External Diameter | 76-178mm |
Roof Pitch | 0-18u00b0 |
Temperature Range | 225u00b0C Continuous - 260u00b0C Intermittent (withstand down to -74u00b0C) |
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
National Flues is thrilled to offer the No 4 Silicone Masterflash. Its high-temperature capability and easy installation make it a top pick for professionals. Plus, with our reliable nationwide delivery and competitive pricing for both trade and retail customers, it's a product and service you can count on.
The No 4 Silicone Masterflash is used to provide a secure and weather-resistant seal around pipes on profiled sheeting and flat panel surfaces, accommodating pipe diameters from 76mm to 152mm and withstanding high temperatures.
National Flues is a leading supplier of fireplaces and flues across the UK. Known for our competitive prices and reliable delivery, we serve both retail and trade customers nationwide, ensuring high-quality products and excellent service.
