This breather & coolant fitting replaces the factory plastic piece on the FA20 engine and results in a 55% increase crankcase ventilation (cross sectional area).

• 55% increase in breather cross section
• Eliminates failure prone plastic from cooling system
• 6061-T6 Aluminum
• Hard anodized black

Update: These can either accept your factory O-Ring or come with O-Ring spacers and a round O-Ring installed please specify in your order notes.