Fernox LS-X External Leak Sealer 50ml

By Fernox Product code: 51999 Pack size: Each

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
Manufacturer ID 61016
Safety Data Sheet click here
Type Sealers & Compounds
Volume (L) 0.05
Pack Size 1
Volume (ml) 50
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 5pm for Monday delivery
  • Orders placed after Sunday at 5pm will be delivered the following Tuesday
Pre-12pm Delivery – £10.00 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 below.
Items over 30kg can only be delivered from Monday to Friday. If ordered before 6pm, please allow up to two business days for delivery. Orders placed after 6pm Thursday will be delivered after the weekend.
More about Delivery
Click & Collect details

Collection Details

Our opening times are 7am-8pm Monday-Friday, 7am-6pm Saturday and 9-4pm Sunday. Please check your local store is open on the store locator page, before you visit.

Once you have placed your order online, we’ll have it ready for you at the store 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.

Don’t forget your mobile number – Make sure your mobile number is added so that we can text you when your order is ready to collect. Please wait for your text or email before coming to collect your items.

If an item is eligible for Next Business Day Collection in store, the order must be placed by 9pm Monday to Thursday for collection the next day. Orders placed after 9pm on Thursday, and up to 5pm on Sunday, will be available for collection on Monday. For larger items over 30kg, please allow two business days.

Fernox LS-X External Leak Sealer 50ml is rated 4.7 out of 5 by 128.
Rated 5 out of 5 by from Gold in a tube !! This is a must for plumbing never had a leak since using this !! Also foid safe and cures with water ! I always insist on this for all my compression joints and sink waste joints
Date published: 2023-05-31
Rated 1 out of 5 by from Simply does not do the job I have tried this in numerous situations for very minor leaks ; it never seals the leak - water collect behind it. It’s little more that silicone sealant and never really the answer to the problem.
Date published: 2023-05-07
Rated 5 out of 5 by from Amazing product I bought this and the leek stopped without me even opening the tube, amazing!
Date published: 2023-04-24
Rated 5 out of 5 by from Worked on a violently leaking outdoor tap. Worked on a violently leaking outdoor tap. Was impatient the first time and it failed. Second time I let it set at least 2 hours and its been bone dry since. Not sure how it is different from normal silicon but it fixed my issue.
Date published: 2023-04-20
Rated 5 out of 5 by from I had a weep from a dielectric connector. Worked a treat. Will use it again. I had a weep from a dielectric connector. Worked a treat. Will use it again.
Date published: 2023-04-03
Rated 5 out of 5 by from A great product. A great product. Sorts out any frustrating leaks after any plumbing improvements.
Date published: 2023-03-24
Rated 5 out of 5 by from Lsx sealant This in is the best sealant for plumbing that money can buy.
Date published: 2023-03-17
Rated 5 out of 5 by from Fernox in a tube fantastic sealer Used Fernox for years to seal compression joints and other sink basin bath shower and plumbing joints to make sure they don’t leak or you get that dreaded drip of water when the taps get hot or running cold water fir a while on pipes that have slight movement in heating systems and around flexible couplings. Provides an excellent flexible seal that can be reopened at a later time if required with out the need for over sized spanner’s or WD40 to loosen the joints, a must for every DIY tool box, tip for users once opened put cling film over the end then the cap will help stop it going hard inside the tube.
Date published: 2023-03-12
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