Kit contents: Six Viton-GF O-rings for Intake Manifold
These replace Honda part number 16075-GHB-B70 , which is a nitrile part.
We use Viton-GF for this application. This kind of rubber is much better suited to the heat at the head, the MTBE and the methanol added to gas. These Viton GF o-rings will seal better and for a much longer time, no matter what the bizarre fuel with which you accidentally fill up your tank, and no matter how hot your engine gets, and no matter what bike fluid gets sprayed all over them.