Adjustable OPV for Gaggia Classic Pro/ Evo.
Only fits the Gaggia Classic Pro/ Evo..
No need to stick to a fixed brew pressure.
Now you can easy install and adjust the brew pressure on your Gaggia Classic Pro yourself.
Simply open the top of your machine, remove the spring and piston that your machines comes with and screw in the adjustable OPV.
Comes with M10 adapter.

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