18mm, zinc coated brass.
Used in some but not all models of:
| MANUFACTURE | MODEL |
| ASTORIA CMA | ASTORIA CMA RAPALLO AL |
| BRASILIA | BRASILIA DECURTIS |
| BRASILIA | PORTOFINO LEVA |
| PAVONI | PAVONI AL |
| VIBIEMME | VIBIEMME REPLICA |
| VICTORIA ARDUINO | VICTORIA ARDUINO ATHENA LEVA |
| WEGA | WEGA ALE |
