Introducing the FlueSnug 5 – this all-in-one seal for boiler flues has been designed to fit a 5” cored hole, ensuring an airtight and professional finish.
Using the FS5 is a quicker, cheaper and cleaner way to seal a hole around a flue. It’s perfect for like-for-like boiler swaps – with no need to re-core, fitting the FlueSnug saves significant time, effort and cost.
This 100mm flue fitting complies with Part L Building Regulations, and is approved by major boiler manufacturers including Baxi, Worcester Bosch, Ideal Heat and ATAG.

• 100mm FlueSnug – an airtight seal for boiler flues
• New size – fits a 127mm (5”) core-drilled hole
• No need to re-core – perfect for like-for-like swaps
• Quick installation – no need to mortar around flue
• Black finish – for a tidy and professional fit
• UK-made – complies with Part L Building Regulations

Delivery (UK mainland only)

 

Next Day: £5, or FREE over £40

- Order by 9pm Mon-Thu: next working day

- Order Fri to 5pm Sun: Monday

- Order after 5pm Sun: Tuesday

 

Pre-12pm: £10

- Same cut-offs as Next Day above

 

Saturday & Sunday: £10, or £5 over £40, or FREE over £75

- Saturday: order by 6pm Fri

- Sunday: order by 4pm Sat

 

Heavy items (over 30kg)

- Mon-Fri only. Order by 6pm and allow up to two working days

- Order after 6pm Thu: arrives after the weekend

 

Supplier items

- Sent directly by the supplier, so timings vary. Lead times appear on the product page in working days (Mon-Fri)

 

More about delivery 

Next Business Day Collection (eligible items)

- Order by 9pm Mon-Thu: collect next day

- Order after 9pm Thu to 5pm Sun: collect Monday

- Heavy items (over 30kg): allow up to two working days

 

Opening hours

- Weekdays vary by branch: open 6:30am-7am, close 6pm-8pm

- Saturday: 7am-6pm

- Sunday: 9am-4pm

 

Check your local store's hours and that it's open before visiting. Please wait for our text or email before collecting.

 

Holding your order
We'll hold it for 14 days, then automatically refund your original payment method.