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From Whole Latte Love Support Library
Coffee Spraying From Portafilter
This machine utilizes pressurized baskets. If coffee is spraying from the spouts of your portafilter during brewing then one of the pressurized baskets is being used without the required 2-way pin in place. A pressurized basket can be identified by holding the basket it up to light; pressurized baskets will only have one hole that you can see through. The 2-way pin must be inserted into the portafilter below the basket when pressurized baskets are being used. Non-pressurized baskets, the ones that have a lot of holes you can see through if held to light, do not require the use of a 2-way pin.
How to Use Gaggia Filter Baskets