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Rockwool Tube - 1000mm long 125mm (90-RPS-125)

National Flues proudly presents the Rockwool Tube – a top-notch insulation solution designed for flue liners, chimney insulation, and high-performance rockwool insulation tube applications. Engineered for excellence, this product ensures your chimney remains efficient, safe, and properly insulated against condensation and high operating temperatures. Whether fitting a 125mm, 150mm, or 200mm liner, our Rockwool Tube delivers reliable results, making it an essential component for every chimney sys Read more...
The price you pay today £39.99
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At a Glance

    Durable, high-grade rock wool construction
    Withstands continuous operating temperatures up to 500°C
    Minimises condensation, mould, and vermin risks
    Versatile sizing: fits 125mm, 150mm, 200mm liners; can be trimmed for 175mm
    Quick and secure installation with recommended foil and aluminium tapes
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Tuesday, July 1st. This is based on current delivery times for this product. Delivery for products not in our warehouses can be delayed because of third party carriers. If you need a stove, or other bulky product, to be delivered by a specific time in the next 7 days then please give us a call. We can sometimes 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 and you can read in our blog about they types and terms and conditions for warranties. Mi-Flex flue liner, for example, comes with a lifetime guarantee. Give us a call if you want to know about a specific warranty. Returns for damaged items are covered by insurance; non-damaged returns incur return delivery costs.

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We will match any price, like-for-like, on a retail basis. Give us a call if you find it cheaper and want to buy from us.

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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]

The Rockwool Tube, measuring 1000mm in length and 125mm in diameter, is an essential component for insulating your flue liner. This highly durable, non-combustible tube is crafted from top-grade rock wool. Not only does it help in reducing the likelihood of condensation within the flue, but it also withstands continuous operating temperatures up to 500°C.

Additionally, it is non-sustaining to vermin and resistant to fungi, mould, and bacteria growth, providing a clean and safe solution for your chimney. Available in various sizes to fit 125mm (5 inches), 150mm (6 inches), and 200mm (8 inches) chimney liners, the Rockwool Tube can be easily trimmed for a 175mm (7 inches) liner. For secure installation, use foil tape for all joints, and for added longevity, apply 50mm wide aluminium tape.

Note: This product is not suitable for Class 2 flexible liners (gas and oil liners).

SKU: 90-RPS-125

Technical Specifications
Length1000mm
Diameter125mm
MaterialHigh-grade Rock Wool
Temperature RatingUp to 500u00b0C
Compatible Liner Sizes125mm, 150mm, 200mm (Trim for 175mm)
Installation RequirementsFoil tape for joints, 50mm wide aluminium tape for reinforcement
For a secure installation, drop the Rockwool Tube in 1m sections as you insert your flue liner down the chimney. Use self-adhesive foil tape to seal every joint between sections, ensuring there are no gaps where condensation could form. For added durability, apply a 50mm wide aluminium tape over the joints. Always ensure the liner is properly cleaned and free from debris before installation. Caution should be taken near any flexible liners as this product is not suitable for Class 2 flexible liners used for gas and oil.

The Rockwool Tube is used to insulate flue liners, reducing the possibility of condensation within the flue, especially in chimneys exposed to harsh weather conditions.

The Rockwool Tube is manufactured from non-combustible rock wool, known for its high durability and resistance to vermin, fungi, mould, and bacteria.

The Rockwool Tube is available in three diameters to fit liner sizes of 125mm, 150mm, and 200mm. It can also be trimmed to fit a 175mm liner.

No, the Rockwool Tube is not suitable for Class 2 flexible liners, which are typically used for gas and oil.

The tube should be installed in 1m lengths as you drop the flue liner down the chimney. Secure each section with self-adhesive tape and reinforce with 50mm wide aluminium tape.

The Rockwool Tube is suitable for continuous operating temperatures of up to 500°C.

Yes, it is recommended to seal all joints of the Rockwool Tube with 50mm wide aluminium tape for added durability and performance.

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