UNI High Capacity Two Stage Pod Filter (Angle Mount / 3" X 6) Uni universal air filters are where it all started over 30 years. For use on motorcycles, go-karts, tractors, air compressors, snowmobiles, or anything with a carburetor can benefit from a Uni. Dual-layer "POD" style filter. Angle 15&#176;. Black inner, red outer.