| CROSS-SECTIONAL SHAPE STYLE | SQUARE/RECTANGULAR TOP RING |
| CROSS-SECTIONAL SHAPE STYLE | SQUARE/RECTANGULAR BOTTOM RING |
| CROSS-SECTIONAL SHAPE STYLE | SQUARE/RECTANGULAR INTERMEDIATE RING |
| MATERIAL | ASBESTOS AND GRAPHITE BOTTOM RING |
| MATERIAL | ASBESTOS AND GRAPHITE INTERMEDIATE RING |
| MATERIAL | ASBESTOS AND GRAPHITE TOP RING |