Leak Sealer F4 is suitable to be used throughout a central heating system to seal small leaks and weeps which may cause pressure loss and boiler breakdown. Once dispersed within the system it will be effective 1-24 hours after application. The unique sealing efficiency of this proven product has been specifically developed to prevent blockages or restrictions within the boiler or vulnerable system components such as pumps and safety devices. Ideal for reducing pressure loss from sealed systems Seeks out and seals most weeps and leaks Does not cause blockages of pumps, air vents, etc. Easily and quickly added via one of the radiators Universal applicator included Patented application Ideal for pressurised systems and combination boilers

Brand Name	Fernox