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Sump Adaptor (325mm sq. plate) - Ø 125 (28-5-SA)

The Sump Adaptor (325mm sq. plate) - Ø 125 from National Flues is a premium, high-performance chimney connection solution. Made from 316 Stainless Steel, this revolutionary adaptor ensures a secure, long-lasting connection between a clay pot and a chimney stack. Ideal for installations where a traditional chimney flue liner is not required, this adaptor significantly enhances the reliability of your chimney system. Whether you're upgrading an existing setup or installing a new one, our quality product stands as the perfect choice for professionals and homeowners alike.
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£34.99
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At a Glance

  • Crafted from 316 Stainless Steel for ultimate durability
  • 1mm thick robust construction
  • 325mm square plate design for a stable fit
  • Designed specifically for clay pot to chimney stack connections without a flue liner
  • Ensures secure, smoke-tested installation for optimal performance

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Have Questions?
Phone: 01670 206999
Email: [email protected]

The Sump Adaptor (325mm sq. plate) - Ø 125 is designed specifically for secure and efficient clay pot to chimney stack connections where a chimney flue liner isn't installed. Crafted from durable 1mm thick stainless steel grade 316, this adaptor ensures longevity and reliability.

Prior to installation, ensure your existing clay liner is smoke-tested for soundness. For a perfect fit, simply place the 325mm x 325mm stainless steel plate against the underside of the stack, mark and secure it with screws, fill in the gaps with Fire Cement and Fire Rope for a seal that's good as gold. The single wall pipe then fits snugly over the downwards facing spigot, finalising your connection with additional fireproof materials.

SKU: 28-5-SA

Technical Specifications
Material316 Stainless Steel
Plate Dimensions325mm x 325mm
Pipe SizeØ 125
Plate Thickness1mm
Stock AvailabilityIN STOCK (79)
Before installation, ensure that your existing clay liner is thoroughly smoke tested to confirm its integrity. Begin by positioning the 325mm x 325mm adaptor plate against the underside of your chimney stack and mark the drilling points. Secure the plate using appropriate screws; then, meticulously fill any gaps with Fire Cement and use Fire Rope to achieve a seamless, fireproof seal. Once the plate is in place, fit the single wall pipe over the downward facing spigot, applying additional fireproof materials to complete the connection. Follow all manufacturer safety guidelines and consider consulting National Flues support if you have any uncertainties during the process.

The Sump Adaptor is used to connect the bottom of a chimney stack that has an existing clay liner, ensuring a secure fit without the need for a chimney flue liner.

The Sump Adaptor is made from 1mm thick stainless steel Grade 316, offering excellent durability and resistance to corrosion.

Place the adaptor's plate against the underside of the stack, mark, drill, and screw it securely. Seal the connection with Fire Cement and Fire Rope, and then fit the single wall pipe over the spigot, finishing the seal with more fireproof materials.

Yes, it's essential to perform a smoke test to ensure the existing clay liner is in good condition before installation of the Sump Adaptor.

The adaptor is specifically designed for use with chimney stacks that have a sound clay liner installed and do not require a chimney flue liner.

The square plate measures 325mm x 325mm, providing a substantial base for secure installation.

Use Fire Cement and Fire Rope around the adaptor plate and the connection to the single wall pipe to create a tight, secure seal.
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Wednesday, April 30th. 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 on a retail basis. Give us a call if you find it cheaper and want to buy from us.

Read our review in our Sump Adaptor (325mm sq. plate) - Ø 125 buyers guide

Invest in the reliability of National Flues – secure your chimney setup today!

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