ERR3457 - Cup Plug

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Cup Plug (core plug) for the 2.5L 300TDi turbo-diesel engine, fitted to the cylinder block and head. A cup plug is pressed into the core holes left by the sand cores during casting , sealing the coolant jacket. The cup-shaped pressing forms an interference fit in its bore to give a leak-tight seal against coolant pressure. Plugs are renewed when corroded or weeping, and during a full engine rebuild. Show more