O-ring kit consist of three O-rings total: one sight window O-ring, one window retainer O-ring, and one filter housing bore O-ring.
All O-rings are made of Viton material, which is chemical and fuel resistant. These O-rings may need to be replaced every few years race seasons and it is always good to have spares just incase.
Racer can pick O-ring kit size from the drop down menu.