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Product Details

Fast acting silicone paste which is used as an effective external leak sealer and jointing compound.

Technical Specification
Brand Fernox
Safety Data Sheet click here
Volume (L) 0.05
Delivery details
Order value: Under £10 £10 & over
Express usually Next Business Day before 6pm £5 Free
Turbo usually Next Business Day before 12 noon £10 £5
Remote areas standard delivery (2-4 days) £5 Free
Order Value: Under £25 Over £25 but less than £75 £75 & Over
£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
If you are using our Click & Collect service please note the following:
  • Order online or over the phone and collect in branch from 5 minutes later.
  • Ensure you check stock is available for collection at your chosen branch.
  • Check branch opening hours to ensure you have sufficient time to collect.
  • For items not available for same day collection, place order before 8pm Mon-Sat (4pm Sun) and you can collect Next Business Day (Mon-Fri) after 3pm.
  • If we have your mobile number, we’ll send you a text when your order is ready to collect.
Fernox LS-X External Leak Sealer 50ml is rated 4.8 out of 5 by 15.
Rated 5 out of 5 by from A good and well known product. I have beee nusing this material for over 25 years and use it for all compression joints to lubricate and seal. It ensures leakproof joints without excessive force to tighten. I do not know why it is described as an external leak sealer, I think you would need to be very lucky for it to work.
Date published: 2019-12-02
Rated 5 out of 5 by from FERNOX Leak sealer Always have used this stuff its great!!
Date published: 2019-11-28
Rated 5 out of 5 by from Leaky radiator I managed to resolve a leaky radiator using fernox. Easy to use and works everytime.
Date published: 2019-11-12
Rated 5 out of 5 by from A brilliant and versatile sealant I always put a smear of this around the olive when making up compression joints for super first-time leak-free jointing. It's worth keep an unopened tube in the cupboard though, as once opened it tends to solidify in the tube after a few weeks (if desperate you can often get some uncured compound by puncturing the back end of the tube though!).
Date published: 2019-11-04
Rated 5 out of 5 by from Never be without a tube I know from experience this stuff has all sorts of uses for making sure water stays wher it should be. Sadly, it does tend to solidify in the tube after a few years, so bought a replacement.
Date published: 2019-08-30
Rated 5 out of 5 by from A toolbox essential Just when a leak appears, I find that the tube of LS-X i have has gone off. Got a new one, two minutes to take aprt and refit using sealer, job done. Always use this, great stuff.
Date published: 2019-07-29
Rated 5 out of 5 by from Fantastic product Great product reliable..........
Date published: 2019-07-11
Rated 5 out of 5 by from The Best. Period! Did I say, the best stuff you can get.
Date published: 2019-07-10
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