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Plug. Location-Cylinder Head. Plug that prevents the engine block or Cylinder Head from cracking in case of freezing coolant. Also used to Plug the casting holes from production. Engine Core. Engine Expansion. Engine Freeze. Engine Welch. Screw. Engine Expansion Plug
Fits A4, A6, allroad, S4
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6972 US Hwy. 72 W., Huntsville, AL, 35806-1726