2 - 11oz Motor Medic C1012 Gunk Radiator Rust-Blocker & Water Pump Lubricant is a versatile formula compatible with all ethylene glycol-based antifreeze and coolants. This advanced solution not only prevents rust and corrosion but also reduces evaporation to maintain optimal cooling system performance. Designed to safeguard aluminum and metal components, it also extends the life of hoses and seals. Experience a cleaner, more efficient cooling system with Gunk's reliable and powerful protection.