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.
Features:
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Quick and convenient – doses in 30 seconds
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Simple to use with no mess
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Added via a radiator adapter or filling loop supplied
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Non-toxic, environmentally friendly formulation
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100% recyclable can
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Seeks out and seals most weeps and leaks
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Saves time and money on draining down and repairing
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Does not cause blockages of pumps, air vents, etc.
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Compatible with all Fernox Protectors