Replacement Silicone Grommets are essential for proper airflow when the Dome Lid is in place. The Grommets slides into the grooves of the Top Ring with the highest point facing inside. It is recommended that Grommets are maintained and replaced every few years if you use your COBB frequently.
The Supreme Grommets should be fastened with the original screws that came with the Supreme COBB. No screws needed for the round Premiers.
Oval Supreme: Requires 2x sets of 3 Silicone Grommets
Round Premier / Pro: Requires 1x set of 3 Silicone Grommets