Mag 1 Transmission Stop Leak provides a concentrated formula intended to address minor transmission fluid leaks by conditioning and rejuvenating rubber seals and gaskets. The additive is poured into the transmission fluid where it blends with the existing fluid and helps restore pliability to hardened materials. Commonly used as a stopgap to reduce seepage between service intervals or to delay immediate gasket replacement. Always follow vehicle manufacturer guidelines, read product labeling for compatibility and dosing instructions, and observe safety and handling precautions.