The ITW Full Throttle Multi-System Sealer restores hardened, shrunken, and brittle seals. It is specifically designed to soften and gently swell the seal, recovering its elasticity before it breaks. The multi-system sealer is for use in engines, transmissions, gear boxes, transfer cases, differentials, and power steering systems. The full synthetic, solvent-free oil-based formula restores gaskets, seals, and O-rings. It is metal and chlorine-free.