Fernox Leak Sealer F4-Liquid

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.
• One 500ml recyclable bottle treats up to 130 litres of system water (16 radiators) and the equivalent of 250m2 of underfloor systems.