Buy Subaru Outback Engine Core Plug. Plug Cylinder Block. Casting, Coolant - OEM Subaru Part # 11021AA020

-9Y. NO.1. NO.3. 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.

PLUG-CYLINDER BLOCK Engine Core Plug

Fits Outback (1996 - 2012)