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 £35

  • Order before 7pm 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 £35 & FREE for orders over £75 (order by 6pm Friday)
Sunday delivery – £10.00 or £5.00 for orders over £35 & 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-7pm Saturday and 9-4pm Sunday. Please 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.

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 branch, the order must be placed by 7pm Monday to Thursday for collection the next day. Orders placed after 7pm 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 4.6 out of 5 by 81.
Rated 5 out of 5 by from Does what it says Excellent Jointing compound - replaces the need for PTFE tape and is very effective
Date published: 2022-04-25
Rated 5 out of 5 by from External leak sealer Good but other brands are cheaper
Date published: 2022-03-27
Rated 3 out of 5 by from Decent sealer but tube nozzle blocks up easterly Nozzle keeps blocking up, I’ve never managed to use the whole tube!
Date published: 2022-03-25
Rated 5 out of 5 by from Greatness Bought these item not only for leaks but also using when new compression joints. Its non hardening, easy to apply
Date published: 2021-10-07
Rated 5 out of 5 by from A handy quick fix I always use the fernox jointing compound on piping and fittings. But this product is handy to use as a sealant and to apply externally over joints if you have a slight seepage. Seems to work ok. I've also used it when connecting water butt hoses to downpipes, ideal.
Date published: 2021-10-04
Rated 5 out of 5 by from Drip no more Excellent product sealed a leaking fitting no problem.
Date published: 2021-09-22
Rated 2 out of 5 by from Not up to the job Bought this hoping it would seal a tiny seeping leak on our bathroom tap. Did not work. It is still leaking. Will have to start again removing the tap and trying to get some pipe tape on the tap tails.
Date published: 2021-09-15
Rated 5 out of 5 by from Cast iron radiation Advised for all the fittings on a cast iron radiator and so far no problems. Like a small tube of silicone (eg smell) but no doubt with plumbing specific properties. Messier than ptfe tape but in some ways more straightforward
Date published: 2021-09-14
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