Fernox F4 Leak Sealer 500ml

Fernox F4 56603 Leak Sealer 500ml is used throughout domestic heating systems for sealing small, internal, inaccessible leaks. Leak Sealer F4 works best in warm/hot circulating water and once evenly dispersed will usually be effective within 1 - 24 hours. Fernox sealing efficiency of Leak Sealer F4 has been intentionally limited to prevent blockage of safety devices, pumps, etc. Compatible with all metals and materials commonly used in central heating systems.

• Ideal for reducing pressure loss from sealed systems
• Seeks out and seals inaccessible, internal microscopic leaks fast
• Saves time and money on draining down the system and repair costs
• Safe to use - does not cause blockages in pipework or vulnerable boiler components such as pumps, air vents and heat exchangers
• Designed to be left permanently in the system - compatible with all metals and materials, including aluminium