Plumbworld has the lowest price for this product!


This handy little tube is the perfect way to create an external seal to prevent against leakages in your boiler and central heating system.

Fernox Leak Sealer LS-X is a 50ml silicone paste used as a sealant and jointing compound on combi and other low water content boilers. Suitable for compression joints and screw fittings, the treatment will last for approximately five years – helping to add life to your boiler and minimise the risk of leakage.

So add a bit of peace of mind that your central heating system isn’t going to experience any costly leaks, by adding Fernox’s Leak Sealer LS-X into your system today.

Product information:

  • 50ml silicone paste
  • Complete leak sealing and jointing compound
  • Suitable for compression joints and screw fittings
  • For external use
  • Safe for use with combi and low water content boilers
  • Will not block valves or vents
  • WRAS approved
CE Approved

£8.27 (Inc. VAT)

11 Available

Fernox LS-X Leak Sealer 50ml - 61016 Reviews

Add your own review
5.0/ 5
2 reviews
  • Chris no longer frustrated
    5/ 5

    New kitchen annoying leak in cold supply joints desplte changing fittings etc etc still leak then was reccomended to try this plumber used it and leaks gone

  • jay
    5/ 5

    Best stuff around and best price by far