Also commonly known asFreeze, Expansion, Frost or Welch plug. Similar to Mazda O.E9930 62 500. x1 Core plug. This provides the interference fit when installing the core plug.
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Mazda N3F1 10 327 RX8 core plug | Freeze | Expansion | Frost | Welch plug
Mazda RX8 1.3 Renesis Wankel rotary Core plug / Freeze / Expansion plug set
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