REV-1 RADICOOL 505R is a premium quality, single-phase, ethylene glycol based premix coolant that provides excellent heat rejecting and aluminum protection for all automotive and light duty diesel applications. It also provides outstanding protection for heavy-duty diesel applications when combined with supplemental coolant additives. REV-1 RADICOOL 505R protects all commons cooling system metals including solder, copper, brass, steel, cast iron and aluminum. This formulation is compatible with all other major brands of coolant and will not affect automotive hoses and gaskets