BOV Kompact Dual Port-34mmDual 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. Supplied With: Port Blanking Plug, Pink Spring Rated 24 to 14 InHg (installed).