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The Positive Crankcase Ventilation (PCV) valve keeps crankcase gasses from building up inside your valve covers, while keeping foreign stuff out. This inexpensive part is important! A broken or clogged PCV can cause excess blow-by or blown seals from too much crankcase pressure.
Fits all 2006-2009 Subaru WRX, 2004-2021 WRX STI, and 2005-2009 Legacy GT/Outback XT. Does NOT fit 2010-2014 WRX.
