PTFE coated silicone sealing ring for Ai SolventVap series rotary evaporators and R series glass reactors. Center frame is made of solid PTFE.

Specifications
| Size | Inner diameter | Outer diameter | Fits Ai models and parts |
| #35 | 12 mm | 32 mm | Rotovap QuickClamp, reactor drain valve tip |
| #40 | 18 mm | 38 mm | Rotovap QuickClamp |
| #50 | 21 mm | 45 mm | Rotovap QuickClamp |
| #60 | 35 mm | 58 mm | Rotovap QuickClamp |
| #70 | 45 mm | 67 mm | Rotovap QuickClamp |
| #80 | 54 mm | 75 mm | Rotovap QuickClamp, reactor drain valve flange |
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