Fernox 56603 Leak Sealer F4, 500 mL, Viscous Liquid Form, Off-White, Faint Odor/Scent

Item Features

• 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.