| 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 | PLASTIC POLYTETRAFLUOROETHYLENE BOTTOM RING |
| MATERIAL | PLASTIC POLYTETRAFLUOROETHYLENE INTERMEDIATE RING |
| MATERIAL | PLASTIC POLYTETRAFLUOROETHYLENE TOP RING |