La San Marco 105 Steam/water Valve Register Pin
Also called a reticulating plunger. Only used with the 105 models:
| Model | Schematic |
| 105 | Steam and water unit |
| Serie new 105 multiboiler | Illustrativo di montaggio rubinetto vapore 105 |
| Serie new 105 multiboiler | Illustrativo di montaggio rubinetto vapore 105 h |
| New 105 S-E | Steam unit/valve SM NEW 105 |
| New 105 S-E | Water unit/valve Practical/Sprint/2/3/4 gr Mod. “S” |
