FERNOX 57883 F4 Leak Sealer 1 Pint (500ml) Bottle

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.

• Ideal for reducing pressure loss from sealed systems
• Seeks out and seals inaccessible, internal microscopic leaks fast
• Saves time and money on draining down and repairing
• Safe to use – does not cause blockages in pipework or vulnerable boiler components such as pumps, air vents and heat exchangers
• Left permanently in the system – compatible with all metals and materials, including aluminum
• One 1 pint recyclable bottle treats up to 34 gallons of system water (16 radiators)

 Product Specifications