Leak Sealer F4 is a internal leak sealer developed for use throughout a central heating system to seal small, inaccessible leaks and weeps which may cause pressure loss and boiler breakdown

• Once dispersed within the system, the product finds the area of oxygen ingress and forms a polymer to seal the pinhole
• Effective within 1-24 hours after application, the unique sealing efficiency of this market-leading water treatment chemical has been proven to prevent blockages or restrictions within the boiler or vulnerable system components such as pumps and safety devices
• A leak can be quickly and efficiently sealed, without the need for a complete system drain down
• 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
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  Safe to use ‚…œ does not cause blockages in pipework or vulnerable boiler components such as pumps, air vents and heat exchangers
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  Designed to be left permanently in the system ‚…œ 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