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DynaGrip (formerly known as CarGo) Seal Tite Radiator Stop Leak 250ml is the only radiator sealing product on the market which contains copper for extra-long blocking power. Designed for all metal surfaces, this solution is ideal for permanently sealing up engine blocks, radiators, heads, head gaskets, heater cores, welsh plugs, any holes up to 0.762mm deep and cracks up to 0.381mm wide.