La Marzocco 1/4" Brass Anti-Vacuum Valve
1/4" Male BSP. Used in the GS3, Linea Mini, Linea PB and Strada models only. Not the same as the (1/8") one used on the steam valve of the GB5/FB80 or (old version 1/4") Linea Classic/FB70. This can be used to replace any 1/4" anti-vacuum valve.
In the Strada model it is located in the right, rear portion of the machine, by the back of the boiler.
La Marzocco part number L193, L193.01 or L193.02