Group Gasket Shim

Shim/spacer for group gasket. Recommended usage is as follows:*

Machines 3-5 years old = 1 shim

Machines 5-10 years old = 2 shims

*Do not use more than 2 shims. If leaking persists after 2 shims and a new gasket, it is time to purchase a new grouphead or a new portafilter. 

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