FERNOX BOILER SEALER EXPRESS F4E

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 | Saves time and money on draining down and repairing. | Add via a radiator, filling loop or TF1 System Filter – all adapters supplied