Camber shims are used for adjustment

to delivery a laminar flow of oil to your turbocharger

1/8' NPT Blank

It has only cover function

https://ozparts

BOV Kompact Dual Port-20mm Xtremeclutch Camber shims are used forDual outlet type BOV. Dual Port vents both to the atmosphere and back into the air intake. Ports with sequential timing allow quieter operation during normal driving, while getting all the benefits of a vent to atmosphere BOV under race conditions. Easily converted to a full atmospheric or full bypass unit by using supplied port blanking plug. APPLICATION: Fits most cars using the factory BOSCH or DENSO bypass valves. Supplied With: Port Blanking