Fernox Central Heating Leak Sealer F4 Express

Quick and convenient doses in 30 seconds|Simple to use with no mess|Added via a radiator adapter or filling loop supplied|Non-toxic, environmentally friendly formulation|100% recyclable can|Seeks out and seals most weeps and leaks|Saves time and money on draining down and repairing|Does not cause blockages of pumps, air vents, etc|Compatible with all Fernox Protectors