The Subaru EJ20 and EJ25 blocks have O-rings between the two block halves. This kit includes all four O-rings used in re-assembling the Subaru EJ case halves.

Set of four O-rings 

Fits;

• 2002-2014 Subaru WRX
• 2004-2020 Subaru WRX STI
• 2005-2010 Subaru Legacy