FERNOX 9 fl. oz. Central Heating Leak Sealer F4 Express Can

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-hour to 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.|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|One 9 fl. oz. canister treats 26 Gal. of water