Subaru OEM Engine Expansion Plug | 11021AA020

Part #: SUB-11021AA020. This plug serves two important functions. Firstly, it protects the engine block or cylinder head from cracking when the coolant freezes. Secondly, it's used to seal the casting holes left from the production process. Note that the gasket is not included, and its part number is 803928010. Warranty Disclaimer: Subaru of America only warrants parts installed by a CERTIFIED Subaru Dealership. The part must match the vehicle VIN. For example, if you install an STi block in a WRX at a non - certified place, don't expect a warranty claim if something goes wrong. Use your best judgment.

Using this Subaru OEM engine expansion plug is straightforward. First, make sure your engine is cool and disconnected from the power source. Locate the area where the plug needs to be installed, whether it's to prevent cracking due to freezing coolant or to cover a production casting hole. Gently insert the plug into the designated spot. Remember, the gasket is not included, so you'll need to get one separately (part number 803928010) and install it correctly. As for the warranty, always have the part installed by a certified Subaru dealership and ensure it matches your vehicle's VIN. This will help avoid any issues if you need to make a warranty claim. For maintenance, regularly check the plug to make sure it's in place and there are no signs of leakage or damage. If you notice any problems, replace the plug right away.