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Fernox Leak Sealer F4 Express 265ml

( 3 Reviews )

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Leak Sealer F4 is suitable to be used throughout a central heating system to seal small leaks and weeps which may cause pressure loss and boiler breakdown. Once dispersed within the system it will be effective 1-24 hours after application.

  • Build Quality is rated at a 5/5 for Fernox Leak Sealer F4 Express 265ml :

  • Ease of Use is rated at a 5/5 for Fernox Leak Sealer F4 Express 265ml :

  • Features is rated at a 5/5 for Fernox Leak Sealer F4 Express 265ml :

  • Value For Money is rated at a 5/5 for Fernox Leak Sealer F4 Express 265ml :

  • Overall is rated at a 5/5 for Fernox Leak Sealer F4 Express 265ml :

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Review for Fernox Leak Sealer F4 Express 265ml by JWP & Sons Gas
22nd February 2021

Really handy leak sealer. Any little weeps you can’t find on a sealed system this normally sorts it out. The new way of introducing into the system is quick and very easy.

Really handy leak sealer. Any little weeps you can’t find on a sealed system this normally sorts it out. The new way of introducing into the system is quick and very easy.


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Review for Fernox Leak Sealer F4 Express 265ml by S Banks Plumbing Heating & Eco Energies Ltd
17th September 2019

I used this a the time in sealed systems just to ensure that the system stayed sealed and any weeps sorted out. Don’t use any other on the market and a good price

I used this a the time in sealed systems just to ensure that the system stayed sealed and any weeps sorted out. Don’t use any other on the market and a good price


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Review for Fernox Leak Sealer F4 Express 265ml by S Seddon Heating
1st September 2019

Great product when used for the right situation, much easier to add to a system than the standard bottle. If you suspect a slow leak on an inaccessible part of a heating system then this is the only leak sealer product I would use.

Great product when used for the right situation, much easier to add to a system than the standard bottle. If you suspect a slow leak on an inaccessible part of a heating system then this is the only leak sealer product I would use.