FERNOX F4 EXPRESS LEAK SEALER 400ml

Fernox Leak Sealer F4 is an 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. Seeks out and seals inaccessible, internal microscopic leaks fast. Quick and convenient – doses in 30 seconds - no need to drain down the system. Safe to use - does not cause blockages in pipework or vulnerable boiler components such as pumps, air vents and heat exchangers. Non-toxic, environmentally friendly formulation, compressed air propellant and 100% recyclable can. One 400ml, 100% recyclable canister treats up to 130 litres of system water (16 radiators) and the equivalent of 250m2 of underfloor system. Add via a radiator, filling loop or TF1 System Filter - all adapters supplied