Fernox LS-X External Leak Sealer 50ml

By Fernox Product code: 51999 Pack size: Each

£5.18 Exc. VAT £4.32

Product Details

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

For use on hot and cold water services, including potable water.
Convenient and easy to use.

• Ideal for use on compression joints and screwed fittings
• Never sets rock hard, joints can easily be undone
• Ready to use, no mixing required
•Does not shrink or crack with age
•Suitable for use from below freezing point to above boiling point of water
•Completely safe to use with drinking water

Technical Specification
Brand Fernox
Safety Data Sheet click here
Volume (L) 0.05
Delivery details

DELIVERY OPTIONS (UK mainland only)

Next Day Delivery – £5.00 or FREE for orders over £25

  • Order before 9pm Monday to Thursday for next business day delivery
  • Order Friday to Sunday before 6pm for Monday delivery
  • Orders placed after Sunday at 6pm will be delivered the following Tuesday
Pre-12pm Delivery – £10.00 or £5.00 for orders over £25, to arrive before 12pm on the scheduled days above

Saturday Delivery – £10.00 or £5.00 for orders over £25 & FREE for orders over £75 (order by 6pm Friday)

Sunday delivery – £10.00 or £5.00 for orders over £25 & FREE for orders over £75 (order by 4pm Saturday)

Times may vary for items being delivered directly from the supplier. For more information, please visit our delivery information page Items over 30kg can only be delivered next Business Day Mon-Fri. Orders placed after 9pm Thursday will be delivered the following Monday
More about Delivery & Returns
Click & Collect details

Collection Details

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

We advise that you check your local branch is open on the branch locator page, before you visit.

Once you have placed your order online, we’ll have it ready for you at the branch you have selected in as little as 5 minutes. We will hold your order for 14 days, after which we will automatically generate a refund to the payment type you used to place the order.

Please wait for your text or email before coming to collect it and be aware that we will still have health & safety measures in place, so we ask that you observe the branch guidelines.

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.

Fernox LS-X External Leak Sealer 50ml is rated 4.7 out of 5 by 65.
Rated 5 out of 5 by from Great Stuff I had a leak from an unvented cylinder making an internal repair impractical, this stuff sealed it up great!
Date published: 2021-07-18
Rated 5 out of 5 by from Great product good price too Very happy with my purchase it’s a great product that I always use for my plumbing jobs
Date published: 2021-07-17
Rated 5 out of 5 by from Good stuff Reassuring for use where a difficult joint is required.
Date published: 2021-07-12
Rated 5 out of 5 by from Reliable leak fix Effective thread seal on a towel warmer that would not seal 100%. Would definitely use again and recommend.
Date published: 2021-07-04
Rated 4 out of 5 by from Does a job I've not had a lot of success with this as an external sealer but find it invaluable when assembling compression fittings, especially radiator tails. A few wraps of ptfe tape and a little smear of this, job done.
Date published: 2021-07-02
Rated 4 out of 5 by from Excellent jointing compound Excellent as a jointing compound. As an external leak sealer, it did not work on a high pressure pipe leak (even with ptfe reinforcement), so it’s perhaps suited better for leaks in low pressure pipes.
Date published: 2021-07-01
Rated 5 out of 5 by from THIS IS EXCELLENT FOR USE ON PLUMBING FITTINGS This Fernox LS-X mastic is excellent for use on various Plumbing fittings - such as Compression fittings - Waste water compression fittings and traps and more. It is very good for sealing small leaks although some consideration should be given to what has caused the leak - for example leaks caused by incorrectly installed fittings / misaligned pipework should not be `repaired` just using this as there could be further / costly leaks in future. I would advise against using on Heating system fittings such as Radiator valves / Pump valves etc. as that can cause small globules of the mastic to enter the system pipework which can then block the very small orifice in some Thermostatic Radiator valves and stop the radiator from working. Chris
Date published: 2021-06-26
Rated 5 out of 5 by from My favourite! The best sealant money can buy. I've used this in plumbing for years and it has never let me down. A high quality product.
Date published: 2021-06-17
  • y_2021, m_8, d_2, h_19
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.18
  • cp_1, bvpage1
  • co_hasreviews, tv_4, tr_61
  • loc_en_GB, sid_51999, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_toolstation-gb
  • bvseo_sdk, p_sdk, 3.2.0
  • CLOUD, getContent, 65.46ms

You might also like

You know the drill, we all love cookies… the ones we use on this site are for analytics, personalising your experience and helping with our advertising to show you more of what we know you’ll love. By hitting accept, you agree to our website cookies.

Hey, browse our site often?