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$0.44 inc GST
In stock
This thin paper seal is used as a calibration shim within 58 mm espresso brew groups. It provides a micro‑adjustment layer between the group head and its mating surfaces, helping baristas fine‑tune gasket compression, improve portafilter lock‑in, and maintain a consistent brew‑chamber seal. Ideal for machines that experience slight tolerance variations or need tighter control over headspace and wear compensation.
$0.44 inc GST
In stock
This thin paper seal is used as a calibration shim within 58 mm espresso brew groups. It provides a micro‑adjustment layer between the group head and its mating surfaces, helping baristas fine‑tune gasket compression, improve portafilter lock‑in, and maintain a consistent brew‑chamber seal. Ideal for machines that experience slight tolerance variations or need tighter control over headspace and wear compensation.








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