BIZOL Radiator Repair+ r71 is a radiator additive Made in Germany developed to seal hairline cracks in the radiator system and gaskets. Hairline cracks and leaks in the radiator system cause coolant loss. This leads to loss of performance in the cooling and heating system and causes damage to the engine. BIZOL Radiator Repair+ r71 contains especially developed polymers which reliably seal the cooling system. These polymers will not clog the channels of radiator or coolant lines. The proper function of the radiator is quickly restored. This product is a ready-to-use suspension for all cooling water and heating systems with and without water filter. Also suitable for aluminium and plastic coolers.