Maintain peak performance and reliability with the GrimmSpeed Air/Oil Separator Rebuild Kit, designed specifically for Subaru WRX, WRX STI, Forester XT, and Legacy GT models. This kit provides a complete set of replacement O-rings to restore your AOS’s sealing integrity, ensuring it withstands hardcore heat cycles and repeated removals without leaks. Perfect for enthusiasts who demand durability or want to keep their show car flawless.

The rebuild kit includes one large O-ring for the bottom of the body, one O-ring for the inner core seal, one O-ring for the top core seal, and three fitting O-rings, covering all critical sealing points. Each component is engineered to fit precisely, preventing oil leaks and maintaining optimal crankcase ventilation.

Ideal for Subaru owners who want to extend the life of their GrimmSpeed AOS or maintain a clean engine bay, this rebuild kit offers peace of mind and easy installation. Keep your Subaru running smoothly—order your rebuild kit today from Subimods, your trusted Subaru performance parts source.