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| Material | Upper Ground | Lower Ground |
| Borosilicate Glass | NS 14/23 - Female | NS 19/26 - Male |
| Borosilicate Glass | NS 19/26 - Female | NS 29/32 - Male |
| Borosilicate Glass | NS 14/23 - Female | NS 29/32 - Male |
They are made of borosilicate 3.3 glass, which is resistant to heat and almost all chemicals. They are used in distillation mechanisms to ensure the connection of the condenser and the balloon. The upper part consists of a female chili and the lower part consists of a male chili.
| Material | Upper Ground | Lower Ground |
| Borosilicate Glass | NS 14/23 - Female | NS 19/26 - Male |
| Borosilicate Glass | NS 19/26 - Female | NS 29/32 - Male |
| Borosilicate Glass | NS 14/23 - Female | NS 29/32 - Male |
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