Fernox Superconcentrate Leak Sealer F4 is used throughout domestic heating systems for sealing small inaccessible leaks. Leak Sealer F4 works best in warm/hot circulating water and once evenly dispersed will usually be effective within 1 - ...

Fernox LS-X  External Leak Sealer and Jointing Compound. It’s a silicone paste used as an external leak sealer and jointing compound. Features Ideal for use on compression joints and screwed fittings Never sets rock hard...

Fernox F4 Express Leak Sealer F4 is used throughout domestic heating systems for sealing small inaccessible leaks. Quick and convenient solution which works in just 30 seconds - simple to use without any mess. Protects against corrosion a...

Fernox leak sealer F4 liquid is an ideal solution for reducing pressure loss from sealed systems.  Fernox Leak Sealer F4 is used throughout domestic heating systems for sealing small, internal, inaccessible leaks. Leak Sealer F4 wor...

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Fernox boiler noise silencer F2 improves heat transfer efficiency. Reduces boiler noise. Compatible with all Fernox Protectors. Non-toxic, environmentally friendly. Can be left in the system permanently. Compatible with all metals and mater...