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Fernox LS-X External Leak Sealer 50ml

( 12 Reviews )

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LS-X is a proven, fast acting, silicone paste which is used as an effective external leak sealer and jointing compound. It is designed for use on hot and cold water services, including potable water.

  • Build Quality is rated at a 5/5 for Fernox LS-X External Leak Sealer 50ml :

  • Easy of Use is rated at a 5/5 for Fernox LS-X External Leak Sealer 50ml :

  • Features is rated at a 5/5 for Fernox LS-X External Leak Sealer 50ml :

  • Value For Money is rated at a 5/5 for Fernox LS-X External Leak Sealer 50ml :

  • Overall is rated at a 5/5 for Fernox LS-X External Leak Sealer 50ml :

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12 Results

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Review for Fernox LS-X External Leak Sealer 50ml by G Potts Plumbing & Heating Ltd
3rd June 2020

Great product to keep in the van, will get you out of a tight spot with those annoying little weeps on compression joints. Only downfall is the end of the tube seals after opening. You end up having to pierce holes in the tube each time you use it.

Great product to keep in the van, will get you out of a tight spot with those annoying little weeps on compression joints. Only downfall is the end of the tube seals after opening. You end up having to pierce holes in the tube each time you use it.


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Review for Fernox LS-X External Leak Sealer 50ml by North London Plumber
9th April 2020

This is one of my go to products when you have that annoying weeping on a joint PTFE and the product on the joint problem solved. I have used it on waste connections with great success as well. Alll round good jointing compound.

This is one of my go to products when you have that annoying weeping on a joint PTFE and the product on the joint problem solved. I have used it on waste connections with great success as well. Alll round good jointing compound.


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Review for Fernox LS-X External Leak Sealer 50ml by A R Nunn Plumbing and Heating
14th November 2019

Good and bad really, can get you out of a situation if a small leak appears but honestly if it’s more than a very small weep it won’t seal. I like the product but most annoying is that once you open the tube it will start to go hard in the tube

Good and bad really, can get you out of a situation if a small leak appears but honestly if it’s more than a very small weep it won’t seal. I like the product but most annoying is that once you open the tube it will start to go hard in the tube


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Review for Fernox LS-X External Leak Sealer 50ml by N omer
28th September 2019

One of the best leak sealer in the market absolutely magic in different ways when it comes to boiler repairs is a must have in a tool box best product

One of the best leak sealer in the market absolutely magic in different ways when it comes to boiler repairs is a must have in a tool box best product


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Review for Fernox LS-X External Leak Sealer 50ml by M&M Gas Services Southern Ltd
19th September 2019

I suspect everyone who works with water or on boilers, has this in the toolbox. gets you out of many a sticky situation, great for setting fittings.

I suspect everyone who works with water or on boilers, has this in the toolbox. gets you out of many a sticky situation, great for setting fittings.


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Review for Fernox LS-X External Leak Sealer 50ml by S Banks Plumbing Heating & Eco Energies Ltd
17th September 2019

I have used it in the past to seal fittings but found it a bit hit and miss. Changed to other brand, as it goes off quite quick too. Not a bad price.

I have used it in the past to seal fittings but found it a bit hit and miss. Changed to other brand, as it goes off quite quick too.
Not a bad price.


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Review for Fernox LS-X External Leak Sealer 50ml by ADOGAS
13th July 2019

Every engineer I know has a tube of this somewhere on his van. Helps with small leaks to TEMPORARILY get things sorted until they can be repaired properly. Used for all sorts of issues. It’s a good product and an even better one when used for its original purpose. Keep one on the van. You won’t regret it.

Every engineer I know has a tube of this somewhere on his van. Helps with small leaks to TEMPORARILY get things sorted until they can be repaired properly. Used for all sorts of issues. It’s a good product and an even better one when used for its original purpose. Keep one on the van. You won’t regret it.


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Review for Fernox LS-X External Leak Sealer 50ml by S3 Heating and Plumbing
23rd February 2019

As others have said it's a must have for the toolbox. Has got me out of a few sticky situations. Not cheap but definitely the best.

As others have said it's a must have for the toolbox. Has got me out of a few sticky situations. Not cheap but definitely the best.


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Review for Fernox LS-X External Leak Sealer 50ml by Vital Plumbers Ltd
22nd January 2019

One of them things you just having your tool bag - I would recommend wearing gloves when using it as it’s not the easiest to get off your fingers

One of them things you just having your tool bag - I would recommend wearing gloves when using it as it’s not the easiest to get off your fingers


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Review for Fernox LS-X External Leak Sealer 50ml by CDG Heating ltd
9th January 2019

This is great for using on olives to stop slight weeps. Also great to stop weeps on other stuff too. Always carry some in my bag. Always sets near the cap but not a problem.

This is great for using on olives to stop slight weeps. Also great to stop weeps on other stuff too. Always carry some in my bag. Always sets near the cap but not a problem.


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Review for Fernox LS-X External Leak Sealer 50ml by Excel heating and plumbing
14th October 2018

Great stuff I always have a tube in my box for emergency’s .......Just remember to wear gloves with it

Great stuff I always have a tube in my box for emergency’s .......Just remember to wear gloves with it


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Review for Fernox LS-X External Leak Sealer 50ml by Omi Gas
13th October 2018

If you need to seal a little weep on a fitting or boiler part till you can replace it works a treat and you can apply it wet and it sets up in 30 minutes.

If you need to seal a little weep on a fitting or boiler part till you can replace it works a treat and you can apply it wet and it sets up in 30 minutes.