Fernox Superconcentrate Leak Sealer is used throughout domestic heating systems for sealing small inaccessible leaks.  Leak Sealer works best in warm/hot circulating water and once evenly dispersed will usually be effective within 1 - 24 hours.  The sealing efficiency of Leak Sealer has been intentionally limited to prevent blockage of safety devices, pumps, etc.

 A standard mastic gun is used to dose the Fernox Leak Sealer directly into a radiator air-vent using the special adapter supplied with the product. The entire process can be completed in less than five minutes!