Top cap is used to close the top of the barrel when you fill it with liquid in advance or store liquid after use.
Specification:
| Capacity | Piston (H, L, R) |
| 5 cc | BC-05 |
| 10 cc | BC-10 |
| 30 cc | BC-30 |
| 50 cc | BC-30 |
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Top cap is used to close the top of the barrel when you fill it with liquid in advance or store liquid after use.
Specification:
| Capacity | Piston (H, L, R) |
| 5 cc | BC-05 |
| 10 cc | BC-10 |
| 30 cc | BC-30 |
| 50 cc | BC-30 |