La Marzocco GS3: Pump Check Valve Below are photo instructions for replacing the pump check valve on a La Marzocco GS3 espresso machine. Tools required: 13mm socket wrench adjustable wrench Once check valve is replaced reinstall braided line and test for flow. Remove left side panel. Swap check valve:
![Clive Logo - stacked - black 600px-1.png]](https://support.clivecoffee.com/hs-fs/hubfs/Clive%20Logo%20-%20stacked%20-%20black%20600px-1.png?height=40&name=Clive%20Logo%20-%20stacked%20-%20black%20600px-1.png){kind=small}
