Gaggia Classic 9 Bar Adjustable OPV Spring Set

This is an adjustable OPV spring set for the Gaggia Classic Pro, allowing users to lower the brew pressure from the stock 15 bar to a more espresso-appropriate 9 bar.

Enthusiasts widely regard this modification as essential for achieving better espresso from the Gaggia Classic Pro, as the stock pressure is too high. It's a popular and effective upgrade for those willing to perform a simple mod.