
Radium O-Ring Service Kit
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Description
Radium O-Ring Service Kit
Application: Radium AOS-R (Air Oil Separator-Return) units
Part Type: AOS-R O-ring service kit
Part Number: 20-0685
The 20-0685 is Radium's AOS-R O-Ring Service Kit – the commonly replaced O-rings for Radium AOS-R air oil separators, including the universal VTE and VTA units and Radium's vehicle-specific AOS-R kits.
It contains replacement O-rings for the AOS-R body, dipstick, water passage plate and coolant fittings, so a unit can be serviced and resealed after disassembly.
Key Features
- Application: Radium AOS-R air oil separators (universal VTE/VTA and vehicle-specific kits)
- Complete Reseal: Covers the body, dipstick, water passage plate and coolant fitting O-rings
What's Included
- 2 x large black O-rings (body)
- 1 x small black O-ring (dipstick)
- 1 x large black O-ring (water passage plate)
- 1 x small black O-ring (water passage plate)
- 2 x small brown O-rings (coolant fittings)
Optional Parts
- Radium Air Oil Separator - Universal Kit (20-0219) – universal VTE AOS-R serviced by this kit
- Radium Engineering AOS-R - Universal VTA (Vent to Atmosphere) (20-0819) – universal VTA AOS-R serviced by this kit
- Radium AOS-R Air Oil Separator-Return Kit, Subaru WRX (2008-2014) / STI (2015-2021) / Forester XT (2009-2013) (20-0607) – Subaru AOS-R kit serviced by this kit
Important Notes
- This kit is for Radium AOS-R units – Competition Catch Cans use the separate 20-0684 CCC O-Ring Service Kit
Vehicle Fitment
- Radium Universal AOS-R, VTE (20-0219)
- Radium Universal AOS-R, VTA (20-0819)
- Radium AOS-R Kit, Subaru 02-21 (20-0607)
- Radium AOS-R Kit, 15-21 WRX and 14-18 Forester XT (20-0258-00)
- Radium AOS-R Kit, FR-S/BRZ/GT86 (20-0351)
Not sure if this suits your vehicle? Email sales@coore.com.au and our team will confirm fitment.

