This IACV gasket (part number 16456-PND-A01) is a genuine OEM Honda part. It is used in the K20A/A2/A3 throttle bodies from 2002-2006 RSX DC5 & Civic Si EP3. 

This gasket is used to seal the air control valve and prevent air from leaking. It can wear out over time and cause air to leak, resulting in poor engine performance or increased fuel consumption.

If you are experiencing idle problems, it may be time to replace this gasket. We recommend using this genuine OEM Honda parts to ensure proper fit and function.