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Fernox Chemicals Fernox Leak Sealer F4 500ml Fernox: F4 Leak Sealer

Ideal for reducing pressure loss from sealed systems Seals most weeps and small inaccessible leaks Saves time and money on draining down and repairing Does not cause blockages of pump, air vents etc. Compatible with all metals and materials commonly used in central heating systems Fernox Chemicals Fernox Leak Sealer F4 500ml Fernox: F4 Leak Sealer

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