Prevents x-shaped end of air filter cage from wearing through air filter.
For 2021 some of the cages have been changed to a more flattened "X" top and they require the Version 2 Nihilo Cage Cap. The "Version 2" is made specifically for the new style filter cage and the caps are white so it’s easy to tell them apart from the older style "Version 1" cage cap. Please refer to the images.