250mm High Ring with slots that match up to lugs on the Breather Frame, and with a simple twist the ring is attached to the Roof Parts. ALL Rigid98 Tube Systems require an Upper Ring.
| HEIGHT | THROAT SIZE (Dia.) | CODE |
| 250mm (10") | 343mm (13.5") | 343-AP-R98-UR |
| 250mm (10") | 457mm (18") | 457-AP-R98-UR |
| 250mm (10") | 535mm (21") | 535-AP-R98-UR |
