Central Heating Internal Leak Sealer - Seals inaccessible leaks and weeping joints in central heating systems. Vitcas>® Internal Leak Sealer is compatible with plastic tanks, micro bore and all metals including aluminium used in central heating systems.Eliminate leaks in central heating Vitcas® Leak Sealer is an internal leak sealer that can help you avoid costly repairs and solve central heating system pressure loss issues. Use it for sealing small inaccessible leaks and weeping joints in central heating systems. It will not block the pump, valves or air vents. A soft seal will form after 1-24 hours of entering the primary circuit. Leak Sealer is compatible with all other water treatment products. Central heating systems should also be protected with Vitcas® Central Heating Inhibitor. Leak Sealer should be added separately. Vitcas® Leak Sealer is only suitable for fully indirect systems. Not suitable for use with PRIMATIC single feed cylinders. 1 litre or 1 tube treats 100 litres. (ap