Fernox F4 Central Heating Leak Sealer 500ml

By Fernox Product code: 92490 Pack size: Each

£11.98 was £16.98 Exc. VAT £9.98
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Product Details

Seals small leaks and weeps which may cause pressure loss and/or boiler breakdown.

Technical Specification
Brand Fernox
Safety Data Sheet click here
Type Accessories
Volume (L) 0.5
Delivery details


Covid-19 Update

  • FREE Next Business Day delivery is available for orders over £25 to home and site is available for orders placed before 6pm Mon-Thurs and before 6pm Sunday
  • Saturday and Sunday delivery is available for orders placed before 6pm on Friday for Saturday Delivery and 4pm Saturday for Sunday delivery, see here for details
  • Pre-12 delivery service is now available. Place your order before 6pm Mon – Fri for next business day delivery by 12pm. Orders placed after 6pm Friday and before 6pm Sunday will be delivered by 12pm Monday. UK mainland only
  • Once your order has been dispatched you will receive an invoice email with the courier details and your tracking number
  • Alternatively go to MyAccount, click on your Order History, click on the TRACK icon to link through to the carrier website and the tracking details for your delivery
  • Delivery direct from suppliers is available and specific delivery times will be displayed on the product page
Order Value: Under £25 Over £25 but less than £75 £75 & Over
Next Business Day Delivery (Mon-Fri) usually before 6pm £5 Free Free
Pre-12 Delivery before 12 noon Next Business Day £10 £5 £5
Remote areas standard delivery (2-4 days) £5 Free Free
Saturday Delivery (order by 6pm Friday) delivered before 6pm £10 £5 Free
Sunday Delivery (order by 4pm Saturday) delivered before 6pm £10 £5 Free


Please note items delivered by our suppliers are not available for the options above. Delivery times may vary.

More about Delivery & Returns
Click & Collect details

Covid 19 Update

Click & Collect

We are fully open and delighted to welcome our customers into our branches.

Our opening times are 7am-8pm Monday-Friday, 7am-7pm Saturday and 9-4pm Sunday

Our speedy 5 min Click and Collect service remains one of the safest ways to buy from us and minimises your time in store. Place your order at toolstation.com 7 days a week, and travel to store once your collection confirmation is received by email or text message.





Don’t forget your mobile number – Please ensure that your mobile number is added so that we can text you when your order is ready to collect.

Your items will be held at your selected Toolstation branch for 14 days, after which point your order will be put back to stock and refunded automatically.

Reviews
Fernox F4 Central Heating Leak Sealer 500ml is rated 4.6 out of 5 by 36.
Rated 5 out of 5 by from Excellent product Used once and it worked - central heating underground pipes leak stopped in one go.
Date published: 2020-08-02
Rated 5 out of 5 by from Great feature Seems to be working at the moment
Date published: 2020-07-01
Rated 5 out of 5 by from Excellent product Had two small leaks. Fernox did the job, no problems, no leaks and constant pressure in system.
Date published: 2020-06-28
Rated 5 out of 5 by from Fernox F4 Good product, used it before. Toolstation were the xheapest by far and excellant service during the crisis
Date published: 2020-06-27
Rated 5 out of 5 by from Has worked in the past. Have used this in the past with positive results, will continue to use for them difficult to find small pressure drops.
Date published: 2020-06-24
Rated 5 out of 5 by from Good service Prompt service, good price and a product I would recommend for any leaking radiators. The repair is only temporary though until you can replace the rads.
Date published: 2020-06-24
Rated 5 out of 5 by from Does what it says! Bought this as a last chance to prolong the life of my boiler. It managed to seal a small leak on my Potterton Promax heat exchanger manifold (200ml overnight) and give me some breathing time! Good value for money. Please note this is a bit like wallpaper paste and difficult to get into a small rad bleed valve!!
Date published: 2020-06-15
Rated 5 out of 5 by from Excellant Price Used this before, excellant produce, does what it states. Toolstation was the cheapest by far.
Date published: 2020-06-12
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