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Fernox Chemicals Central Heating Leak Sealer F4 Express – 400ml 62422

Fernox Leak Sealer F4 Express is used in domestic heating systems for sealing small inaccessible leaks. Leak Sealer F4 Express works best in warm/hot circulating water. Once dispersed evenly in the system water it is effective within 1 – 24 hours. The sealing efficiency of Leak Sealer F4 Express has been formulated to prevent blockage of safety devices, pumps, etc. Fernox Chemicals Central Heating Leak Sealer F4 Express – 400ml 62422

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